Discord ain’t it. There’s got to be folks over on this instance e.g. that would be interested in setting up a Shadowdark community, right? Right?? I don’t want to contribute to enshittified reddit’s bottom line, but the Shawdowdark subreddit is one of the only reasons I still open up that tab every now and then…
The Arcane Library discord server and the Shadowark official Facebook group are both quite active. There is an itch jam underway with 32 submission so far.