I’m guessing it’s like MacOS where if it’s a game not on Steam then you’re shit out of luck if there isn’t a Linux specific version?
In addition to the options hamsterkill said, I run a lot of non-Steam games through Steam without issue. I've even run non-game software through it.
For sure if you are already planning a hardware change, but but with the state of the world, using what you have is the only option for a lot of folks.
One of the great things about Linux is choice. I try not to discourage options, even if it is not my preference