What I like to do is to join servers run by creators I like - they tend to advertise them in their updates/descriptions or social media accounts (at least I do because it's my favorite way to communicate with my readers and creator friends). It's a great way to make genuine connections because there's already common ground with everyone involved - love for their work!
YMMV but with general creator support servers, they're often frequented by tons of people who want to promote their work and just drop links, and not as much by people who actually want to check out said work. If meaningful networking is your goal, you'll probably want to take a quality over quantity approach. I've seen a lot of people slowly but surely gaining more of a following and making artist friends by actively being involved in communities rather than just spamming - not even necessarily comic-based communities, but for instance fandom or YouTuber/streamer servers where they contributed fanart. In those cases checking their social media or googling "[fandom] Discord server" and the likes usually does the trick.
