Basically c/chat + c/gaming. Anything that increases socializing is good especially considering loneliness is on the rise in modern times.
The Lemmyverse chess event just ended https://lemmy.ca/post/292674 which is the most collaborative fedi gaming thing I’ve heard of.
Lemmygrad might have a video gaming together thing too.
List what multiplayer games you’re willing to play with other Fedizens.
I have recently been mostly into Satisfactory and Factorio, though I am also a big fan of Crusader Kings II and III, and I might pick up Victoria 3 at some point soon. Definitely also interested in doing a Minecraft/Minetest server!