Aside from the fediverse what are some alternatives you found to reddit communities you used to rely on or frequent?

For anime there's not really activity for episode or Manga chapter discussions, and found that the My Anime List forums ended up filling that void. https://myanimelist.net/forum/

For buildapc checked out pcpartpicker and found they had a forum with people to help and being pcpartpicker the layout of parts is really nice when people suggest them to you https://pcpartpicker.com/forums/forum/27-create-a-part-list-for-me/

For more casual stuff like pics and memes found squabbles has pretty good activity https://squabbles.io/

For NBA stuff found realgm forums with lot more activity for individual team boards https://forums.realgm.com/boards/

For video game deals found this forum https://www.cheapassgamer.com/forum/10-video-game-deals/

It was nice that forums are still alive once I finally tried to seek out communities outside of reddit after all these years