VT
Vanguard Total World Stock ETF
stock NYSE ETF

VTI+VXUS in a taxable account, VT in a Roth IRA.

Don't overthink it. Just keep investing. Over the long haul it really matters zero the tiny changes you're considering. But hold off on any new money into Bitcoin for now until Bitcoin is <10-15% of total net worth.
My general rule would be VT for the first $100k, then add SCHD or DGRO and/or emerging markets, and gold or Bitcoin. But honestly, it probably doesn't matter that much.

“I heard diversification is good but I also read just sticking to ETFs is better.”
Like previous guy said: investing in ETFs is inherently diversification. Also, of the 4 individual stocks you bought, 3 of them are already included in VOO, so you didn’t diversify further anyways. You could add small and mid cap ETFs and international to diversify further. You could look into VTI, VT, and VXUS. VT is an easy way to hold the entire stock market. Many ppl go with VTI (all US) and VXUS (international). These are just some ideas. Figure out what works for you

Don't. You just need to look up studies in trading outcomes. Every study ever done, including at professional levels, shows some variotion of the following: shorter term anyone can get lucky. Longer term, the number of traders beating indexes and returning profits tends to zero, and very very quickly. After just 5 years you're in low single digits and it just keeps getting worse. And critically, ones who were successful in y1 aren't then consistently lucky in y2, y3, y4 etc which rebuts the theory that "well if 2%" are ahead then this proves they have skill, but it proves nothing of the sort. These are the survivors. Someone gets lucky each year, therefore some people out of millions can get lucky after multiple years. 
The only reason you think trading is easy is because it gets falsely portrayed in places exactly like this sub. The odds are overwhelmingly against you beating the indexes. You only have one life, not 100. Invest in a global etf like VT. Top up every month regardless of price and retire rich. It's literally that simple.

I started my investing journey couple of months before "liberation day"
my 1st lump sum buy was at $544
I brought it down to $530
my total investment is $11k
I am non-US person
as of right now, I am $30 in profit total
1. Should I sell VOO at my near entry point and then re-buy at lower price?
2. Should I sell all VOO and buy VT instead, because of ongoing US economic wars

VT and sleep
But you may need more than that.
Maybe buy UHNW stuff
Like foreign passports
Put some accounts in Switzerland and high trust societies under other companies
Buy some real estates in great societies. Swiss Norway Australia or new Zealand.
Just regular places in good enough safe neighborhoods
And the rest in VT
Some farmland
Maybe small property in Argentina.
Shed luxury and wastefulness
Just essentials

A portion in the global stock market, a portion in diversified municipal bonds duration matched to any obligations, and a portion to broad insurance in various forms. Cash in municipal money market funds.
I would also hire CPAs and lawyers to optimize my taxes and protect my wealth using LLCs and various types of trusts.
$50M in VTI+VXUS would cost around $20k/year, which might make index replication strategies start to look attractive if cheaper than the fund cost. Especially if combined with aggressive tax loss harvesting. That said, it’s close enough that I would probably still stick with funds. I would use global market cap weights, but I wouldn’t use VT due to the extra expense and FTC. Plus, I would still have VT in my retirement accounts, and I wouldn’t want to risk wash sales.
Federally tax exempt bonds, like munis, would likely provide the highest return for bonds, since the dividend on the equity portion of the $50M would put me in the highest tax bracket. Similarly, municipal money market funds would be a good place for cash.
Insurance might be the most interesting and complex question for me. I would look for broad ways to reduce risks that I am currently unable to mitigate. I would also need to deal with risks inherent to owning $50M. Physical security, land, and insurance policies would all be important.

The bid/ask spread is exceedingly low (like, pennies) for high-volume ETF’s like VTI and VT.
It won’t make any material difference.

The future pricing of securities is nearly unpredictable. 
Knowing this, I would acknowledge my limitations and act as if I have zero idea what will happen (I don't).
So... VT and BND (or BNDW) in some ratio, to have as much diversification as possible, weighted automatically to market caps. 
Fairly hands off and as close to world average as I think I can get.

Personally, I would probably diversify a little bit.
Some in private lending, some RE, bunch in VT or VTI/VXUS, etc
Just spread out the risk so you aren’t overweight towards one asset class

VT & chill.

Add VXF to round out the US market. Add VXUS to have the whole international market.
* VT = 60% VTI + 40% VXUS
* VTI = 80% VOO + 20% VXF
* VT = 48% VOO + 12% VXF + 40% VXUS

I've gone through the same dilemma.
I started with a 10% US tilt last year, but decided to change to market caps this year because 1) if markets are truly efficient, it just makes the most sense. I don't know enough to bet an extra 10% on the US, and 2) market caps make it easy to integrate holdings across multiple accounts. I can use VT. Target date funds and robo-advisors go with market caps. Overall it just gives me flexibility and ease.
As far as VT versus VTI + VXUS. VT is less to mess with. It naturally adjusts to market caps as the weightings change over time. It makes it less tempting to try to time the market or react and change US/ex-US allocations in response to the headlines. Screwing around with things can easily cost a lot and possibly more than the foreign tax credit.
VTI + VXUS gives you flexibility to tilt your allocation (although you could also do that with VTI + VT). VXUS gives you access to the foreign tax credit which is about 0.2%. So on a million dollar portfolio at 60/40 weights, that's $800 for an extra line on a tax form when your "income" might be about $40k if you're withdrawing 4% from your portfolio.
I think either VT or VTI + VXUS are great choices. You have to weigh the pros and cons for yourself.
I don't know that I would sell the VT that you have... it will probably cost you more than you will gain. If you want to "switch" to VTI + VXUS, just add them around your VT position.
If you prefer simplicity or are a helpless fiddler that might try to change allocations and time the market, stick with VT. If you don't mind the extra "work" and want the foreign tax credit, go with VTI + VXUS.

For a retirement account that needs to weather 40 years of global volatility, I'd probably run VT/BNDW or ITDI.

It's taxable, I have $20k in VT but I've made some gains so I'm assuming I'll have to pay tax on that if I sell (kinda new to all this). Do you think 70/30 vs 60/40 long term will make any discernable difference? Feels like I'd be better off just earning more money so I can contribute more each month.

At Fidelity, there's no Fidelity mutual fund (or other fee-free) equivalent of VT, and VTWAX has transaction fees.

VTI + VXUS is only more tax efficent than VT in a taxable brokerage account.
If you think 70% US / 30% International is what you want, and it's not performance chasing, but the long term allocation you're going to stick with, then it probably makes sense to just use VTI + VXUS.
If you currently own VT in a taxable brokerage account, you could consider selling any shares at a loss to buy VTI + VXUS, and make future contributions as VTI + VXUS at the ratio you want.
In a Roth IRA (or other tax advantaged account) you can just exchange everything to get to what you want to be at.

Is this in an IRA? If yes, sure, it’s easy enough to sell VT and shift all to VTI/VXUS, which is my preference. If not, then just allocate the future funds however you want.

Roth just VT it. Brokerage VTI+Vxus

I’m doing 80/20. If I could do it all over I would do 70/30 or 75/25.
I don’t like doing VT as you can’t claim FTC.