I use keepass and have for years and I wanted to switch from using google drive to something more self hosted so I tried sync-thing. I have been a C and C++ developer for over 40 years and I found it one of the most obtuse things I have ever tried. I'll have to get back to it. :) It's still running but somehow never syncs a single file between the desktop and the linux server. I don't think the android client can run on a modern pixel phone anyway anymore due to security constraints.
Syncthing-fork is running perfectly fine on my Pixel 9. The web interface is definitely better than the default app interface, it's a shame they even bothered with that app interface.
All you have to do is exchange "keys" with the two machines you want to sync and then it's mostly set and forget