what is the best Firebase alternative for flutter to migrate as fast as possible?

Question

We just launched a project that uses Flutter and Firebase services: Auth, Firestore, Functions. We just find out that Firebase doesn't work on Huawei phones. Which backend service is the fastest and most reliable to use in Flutter to migrate the entire project?

Solution

I just migrated an entire project to Supabase and it is a great alternative, Also as mentioned in the comments by Ranvir, AWS Amplify is another alternative, but needs more work.