I just realized but now that tachiyomi died a while back, I can share what I use (which from my understanding is the successor of tachiyomi)
For the app: mihon https://mihon.app / https://github.com/mihonapp/mihon
For extensions: keiyoushi https://keiyoushi.github.io / https://github.com/keiyoushi/extensions
You can just restore a backup from tachiyomi and be as good as before (or if you are just discovering it, it's fine too)

