It's better to just look for a game /you want to play/. Chances are, it'll "just work" via proton even if there's no native version. Right click game -> Properties -> Compatibility -> Pick any recent version.

Or, to answer more directly, I've recently played on linux via steam and can recommend:

- Total War Warhammer II (native, don't need the DLC unless you want to play specific factions)

- Frostpunk (proton)

- Don't Starve (native)

- Civilization VI (native)

- Factorio (native)

- Crusader Kings II / III (native)

- Valheim (native)

- Pathfinder: Kingmaker (native)