Upvote for keepassxc. I've been using it and its predecessor with the same database file for something like 15 years and have seen many of these services come and go in the meantime. It will outlive Bitwarden for sure.
Yes KeepassXC is great. Nextcloud passwords is actively developed and looking good except for the Linux app failing on Arch.
I use KeepassXC and Strongbox.
syncthing works really well imo, can also tell it to keep 3 versions as a backup
I had conflicts that needed manual intervention too often. It is not something that most users would put up with.