At the moment, I'm actually only playing two games. I play Trackmania 2020 every day, the game is great because it is populated with content from the community to a very large extent. Every day, a new map is added to the game, on which a tournament is officially played every day. Furthermore, there are so many tracks built by other players that you will probably never have played all the maps.
And then I still play WoW Classic and WotLK - the game has actually been following me since 2004 and has not let me go since then...
Shoutouts to TM2020. I somehow missed that games release until it came around to Steam not that long ago. I loved me some TMNF and TM2 so its been a real joy to dive back in.