For all of you storing your keypass database on commercial cloud drives like google, Microsoft etc. I recommend to have a look into bitwarden.
Bitwarden is also for free and it comes with the cloud service included. The bitwarden database is stored in the bitwarden cloud. bitwarden software is open source(!) and has been audited several times (anual audits by third parties). Database is encrypted on the client and then uploaded to the cloud. That is pretty much what you intend to do with keypass and GDrive or Microsoft cloud.
Positive side effect with bitwarden:
no extra cloud provider needed
excellent clients and browser extensions for various operating systems incl. iphone, android, windows, etc..
Database is kept in sync automatically by the client. No extra effort with rclone or such.
clients work with local copy of the database and do not need internet to operate
extra features like “emergency access” (only for premium accounts for 10 USD/yr)
I am not affiliated with bitwarden. I am just saying.
If you want a “serverless” sync of your kbdx file (and other files of course, too if you like) you should have a look on https://syncthing.net/
The service once set up is running in the background and you can sync whatever directory with other syncthing clients - directly, P2P, no server needed. Theres also a syncthing-fork android client on f-droid.
I use it to sync 4 laptop devices and 2 androids (and for availability 1 always on debian-home server on a HP t630 thin client. Along with security related kbdx I sync my 500 GB media files and some other stuff. Real cool. Take a bit to get familiar with, but absolutely worth it!!