Backup your notes, and profile. I've had success with:
https://nostrsync.vercel.app/
Then login to Nostr using a different client, like Jumble (web), or for a native app, Damus, Amethyst, and Yakkihone are popular.
They each have their own quirks/drawbacks. I've joked before that one needs about five clients to have a complete working feature-set (for a social media use). 😜