Check Proton DB. If the games you enjoy work fine on Linux, which is the case for most games these days thanks to Proton, you should be good. The big exception is games with kernel-level anticheat.

If not, you can always dual boot for the few games that don’t.

I made the switch to pure Linux gaming when I got my Steam Deck two years ago. Been loving it ever since. Even SteamVR games work great streaming to my Quest headset.

The only things that don’t work at this point have actual malware as a mandatory requirement