I used KeePass2Android for a long time on devices without GOS but I don't think the project is actively worked on anymore.
I used KeePass2Android on other devices because of the built-in keyboard that does not spy on your password and the auto fill feature this keyboard has but that's no longer an issue with GOS. The app has some issues with GOS's enhanced security features so I do not mind ditching it.
What FOSS projects (and links to these projects) are currently suggested as offline database password manager for privacy and strong security and can I export my current KeePass2Android database and import them so I don't have to rebuild my kdbx database.
I don't need any online features. I want to stay in full control of my passwords. The database is used offline but offline integrated backup sync to USB features would be nice.