Smart move, unless you really know what you're doing and have redundancy. When I first made the switch from Lastpass to Bitwarden I had tried to host the vault myself instead of using the cloud version, which worked fine right up until the moment I had a server outage and lost access to all my passwords.
Oh man, that's actually really good advice! I recently switched to Vaultwarden, but you're right: If my server goes down, I can't even restart it, because the password for my account is in there! Damn! Close call!
Well with bitwarden/vaultwarden you can have a copy of your entire vault on your phone or computer or both... so even if your server was totally dead, you'd have access to your passwords. Solid backups is a must, I follow the 3-2-1 rule on super critical systems (like vaultwarden) and test that you can actually recover. Something as simple as spinning up a VPS, testing a restore, testing access, see if that could work in a pinch until you get your server back online, then tear it down. Linode is very cheap for this kind of testing, it'd only cost you a few pennies to run a "dr" test of your critical systems. Of course you still want to secure it, I'd recommend wireguard or tailscale instead of opening access to your DR node to the internet, but as a temporary test it's probably fine if your running patched up to date versions of docker, vaultwarden, and I'd always recommend putting a reverse proxy in front like nginx.
I still don't get why people want to have cloud-based password managers. Keepass works in all major platforms, it's just one file, which it is super easy to sync and/or merge. It can integrate with your browser/Os if you want, but otherwise the surface attack is basically zero.