r/writtingprompts by far my favorite community of all time and I hope it makes a resurgence

Other ones would be r/the10thdentist, r/nottheonion and r/askhistorians (they probably will never join since they have their own website to fall back own if it all goest to shit)

Lastly r/manga, I said this one as separate because I have seen a few but the community is not there yet, especially lacking features like what are you reading this month and at MOST having 15 subscribers