1. Tachiyomi
2. 1dm+
3. Vanced(revanced)

Why? what did you do?

I've been using it for two years and haven't had any problems.

I don't think there is, but there is a script for migrating subscriptions to communities from one account to another. https://github.com/wescode/lemmy_migrate

I hope so

https://github.com/maltfield/awesome-lemmy-instances