I have 58 right now! I haven't been playing much lately and I need to change that.

I have ★ 35, maybe because I renovated my island and I've been deleting many Miis that I didn't really like...

I can relate, i dropped to 39 after this post deleting miis i didnt like

Deleting miis will bring the island rating down for sure. I haven't been gaining stars very fast since I barely ever add miis.