If you joined Mastodon because it was small and quirky and whatever non-mainstream group you align with felt like it was welcomed, and comfortable, and safe here, I've got some really bad news.
You didn't find a space that was inherently suited to your wants, but one that happened to support them. Because of scale and founding cohorts.
Those are the first two characteristics to be lost in any growing community. Unless it was dead-normal to start with, and even then I'd bet against it.