

Don’t get a 50 series card. If you must upgrade I’d go for a second hand 40xx. But honestly with a 3080 you’re perfectly fine for now if you’re not married to ultra 4k 144hz.
I’m on a 3070 and it does fine for most games. That said I don’t play a lot of AAA titles but the ones I do play fine at medium or high settings mostly.
Also I used to dual boot, but since about a year I moved to 100% Linux and have only had the occasional issue. Mint with Nvidia send l seems to work pretty well these days.
And stay down