I'd e.g. offer testplaying/streaming on youtube (when browsing here in the community/forum's "game-feedback" section), if player's would be open for suggestions or getting their released versions tested by other dev's.
discord do have a disboard-page which refers to severs and there are also tags like "gaming", "twitch", etc. about 3 platforms you've mentioned, I didn't heard of them yet. Still maybe even collaborating with users could be fun e.g. offering translations for their game/s, if you could get suggestions/feedback to yours?