I'm glad more people are trying Mastodon, but I never personally recommend Kirakiratter to non-Aikatsu fans because people who are just looking for a Twitter replacement can easily find that on any Mastodon instance.
For smaller instances like this, the community is what makes it special, and I think you're really missing out if you're not here for the local timeline experience (i.e., it's like one big chatroom where everyone communicates via the LTL, which is very different from Twitter)