I was going to say replaying but I feel like that limits the question to games like Prey or Fallout New Vegas that have endings and games like The Sims 2 or Cities Skylines where you can play indefinitely end up excluded.
I’m not really referring to games like League of Legends where you’re coming back every month. More so games where you stop playing for an extended period of time.
I have an unhealthy cycle of this with Hearts of Iron IV a WW2 grand strategy game. I’ll realize the embarrassing number of hours that I’ve put into the game and then I’ll stop playing for a while. But then one of the big mods for it will update and then I dive back in and lose a weekend and then the process repeats.
The other game I consistently come back to is Threads of Fate or Dewprism it’s a PS1 action-RPG with dual protagonists where each one has their own campaign or story to play through. I guess it’s nostalgia that keeps me coming back to it, but it really wasn’t a favorite game growing up and I didn’t beat it until years after I’d gotten it. But every few years I’ll just remember it out of the blue and get the urge to play through it again.