The decentralised alternative is to use something like SyncThing[0]. It's what I use and is only slightly more involved.
I use syncthing for some backups, no idea why I've never considered it for keepass. Probably cause I don't want to mix the two and clients don't offer it already integrated. Or are there any? It for sure wouldn't make building the project more easy, and the password manager is the one thing i still want to build form source to at least imagine I have full control over it.
I was always a bit paranoid about this, even though I did it myself.