There are certainly options, but they are older or just not fully fleshed out for sim racing, Hardware has gotten pretty well supported now. And games like Le Mans Ultimate had their on proton fork to get it working. But If you want big races you are very limited software wise, you kinda only really have iRacing or LMU. And They both devs have been unsupportive of linux, although LMU does still currently work.

In terms of sims that do work, Automobilista 2, Raceroom, Assetto Corsa, AC Rally, AC Evo, AC Competizione, BeamNG.Drive, Dirt Rally 2.0 and i think Live for Speed.

There are options that are fun, but AC Evo is rough, AC Rally is great but you can tell it is Early Access. And honestly nothing on that list ticks the same boxes as iRacing or LMU for racing.

Outside of that though, I could absolutely switch away from windows. Nothing else I play or am looking forward to getting to play will have issues running