I like the idea of Mastodon and I'm glad it exists, but I've yet to find a particular niche for which there is a server where I want to participate. Usually these days I'll just stick to a Slack workspace, a Discord server, or a Facebook group if I want to engage with a community publicly, and I'm already off of Twitter altogether. I'm guessing it's just a cold start problem.
What the best way of discovering active Mastodon communities one might want to be part of?