Portal 2 Co-op with someone that never played it could be good. I played it with a lot of friends already, but it still felt like a different experience with each of them.
As of a game I'm currently replaying, Last Command B-Side on Nightmare difficulty. Cleared hardcore difficulty previously, but Nightmare mode doesn't let you play safe.
For a game I cannot replay, Overwatch 1. Overwatch 2 doesn't give the same vibes as OW1, everything feels more clunky to the point I quit it. I didn't really like OW1 that much to begin with, had like 200 hours tops on it; but really felt its absence after OW2.
Headbangers: Rhythm Royale was also another game I really enjoyed that didn't really took off after launch. I still play it at times, but it's entirely bot lobbies and they suck at the game. I miss needing to try hard to win a round on it.