I considered KeePass+ Synching but tended to run into the same issues as with Owntracks - Android is hostile to always on background apps. Then when it came time to onboard my spouse, KeePass wasn't an option.
I don't understand how people keep recommending Syncthing like it's a magical solution. It is not, it fails constantly, has weird, unfixed upstream bugs if you use encryption. It's definitely a maintenance burden as well.