Check out Amber https://github.com/greenart7c3/Amber
"Amber is a nostr event signer for Android. It allows users to keep their nsec segregated in a single, dedicated app." It works well with Amethyst.
Follow list should just work. Maybe do a backup first. https://metadata.nostr.com/
Relay setup is a bit different now, but your relays will work. If you have any questions once your setting up, just ask.
You can even run a local relay on your phone, compatible with Amethyst.