I stopped playing online competitive games a while back, the last ones were overwatch (1) and dota. Now I almost only play solo games and I have a lot of fun. Currently 110+ hours in TOTK and I'm far from done with it. It's a category that's far from dead and there are any flavor that could fit your tastes.
The only online game I keep playing is MK8D because frustration never last long and there's no ELO ranking to be obsessed with. Also Splatoon once in a while.