My chill out game atm is Forza Horizon 4, FH4 is awesome So well optimised.
I nearly completed RDR2 on PC but restarted it so I can enjoy a certain period that i wouldn't want to spoil, been playing that since just before christmas on/off when I fancy that particular immersion and its amazing on PC, well optimised by now, haven't bothered with the online after seeing what GTAV became lol.
If I feel creative I play Oxygen Not Included or Factorio but I haven't played them quite so much lately as I've spent more time on RS during lockdown. tried getting into MC but it never holds my attention
Would recommend Doki Doki literature club to anyone with a few hours to spare wanting a free interesting game to play though