Does anyone know the current state of gaming on Linux?

I'm 100% ready to remove Windows on my main PC but, the main thing that is stopping me is the gaming aspect. I did see like a year or two ago there was some nice things happening (e.g. proton) but, I have games from other places other than steam and AFAIK proton isn't for 100% of games and stuff.

I would set up a Windows VM and run the games through that but, all the tutorials I've seen have like 2 graphics cards (one for Linux and one to pass through to the VM) and my current setup won't allow for that (had the system for 6 years now, maybe it's time for a full upgrade).