Something I'm starting to understand the current age of social media is that there is a difference between audience and community. I get a sense Twitter, Twitch, and YouTube are the only platforms that cultivate the Creator and Audience relationship. It makes sense on Twitch and YouTube because the content is primarily one way (setting aside the comment section). Everywhere else seems like community focus first. Cohost, PillowFort, Discord, most Fediverse services (Mastodon) and even the current form of Tumblr. If you try to do promotion on those platforms you'll likely get ignored. I like that. It feels more like the old school message board era of the internet. The problem is how do artist, illustrators, cartoonists, and comic makers find an audience now? Twitter seems to be the only place for "audience building" and that seems like a loosing endeavor.
And yes I know you can technically do promotion on all those services but don't believe in knocking on someone's door to tell them about a "great offer" if they have a sign above their door that says "no soliciting". I'm looking for an audience. Not trying to make a sale.
Then there is Instagram which might technically be a place for an artist to cultivate an audience but for many reasons the audience is inactive. From a 100k following maybe 10 of them will back a crowd funding project or become patron. The assumption from the handful of creators who use analytics is that they are assuming there might be more active audience members on Instagram but they are also a follower on another platform they prefer more. The fact that Instagram is effectively an app only platform (the website suuuucks) and it does everything to keep you from leaving app has a lot to do with that.
All that said Discord is a special case. If it a server for an existing fan group, like that of a Twitch Streamer, YouTuber, Video Game Studio, or Patreon reward, then that is certainly a Audience and Creator relationship. But creators wouldn't doing any audience building there because everyone there, presumably, is in their audience.