Looking for a multiplayer game to spend as much or as little time on as you like? Let me recommend #GuildWars2.
It's an MMO, yes, but one without a subscription fee, without gear grind, and it's not pay-to-win. You can literally drop out for a year, come back, and all your gear and progress are still relevant. It also has a very generous free-to-play tier, you can basically "try it out" for months.
