As a UK national I would love to move to the US for better opportunities and weather. Getting a visa seems next to impossible, short of marrying an American. I probably missed my chance in the pre Covid tech boom.
I dunno, if you've made enough money to enjoy it (like, say you've been in Bay Area "Tech" for a few years), London seems like a cooler place to be. You lose on dollars and cents, but I'd think you'd win on lifestyle. I don't just mean "work-life balance"; I mean it's a nicer, more interesting, more stimulating place to be.
The boom _during_ Covid has been crazy, but I think it's still possible to get a FAANG job that will get you to the US. The other route would be joining a FAANG in the UK and then changing teams after 1-2 years.