My suggestions are all open-source, and therefore free forever.
Beyond All Reason is an amazing RTS. I’ve heard people say it’s one of the best RTS in existence, but I haven’t played any other RTS myself, so I can’t verify that.
Space Station 14, a remake/continuation of Space Station 13, is a top-down multiplayer role-playing game. I like to describe it as “Among Us but in way more complicated”, but it is sooo much more than that. The learning curve is steep, and rounds usually go for at least an hour, but if you want to try out new stuff, give it a go. In my experience, the community is really welcoming of new players.
SuperTuxKart is arguably the definitive open-source MarioCart clone.









No, a Lemmy instance can ban you, and that won’t/can’t ban you from creating a new account on another instance.
But, that said, instance admins do talk to each other, and if you’re being a dick everywhere, you might find yourself getting less benefit of the doubt.