@Yukari For advice on moving instances. For now I would wait a little until all the people moving has happened and then it will be easier for you to decide. I'm currently on @mstdn.jp one of the bigger instances in Japan. It has a slightly older version of mastodon but seems to be well maintained. Just stay away from pawoo, it has horrific stuff on it unfortunately even though it's a solid server. Fedibird seems to be popular too, and is another Japanese server.
@terrywallwork@mstdn.jp I have an account on .jp and I know I won't be going back there. fedbird is popular but I don't know if I wanna go there either. I'm happy to wait...