Use cryptomator on your cloud of choice (google drive, dropbox, whatever). Cryptomator
sets up an encrypted volume on cloud drives, much like Truecrypt and Veracrypt. Now store your keypass.db file in that encrypted volume container instead of nakedly on the cloud drive. Bonus: Cloud drives, Cryptomator, and Keypass are all available on Windows, Mac, iOS, and Android
From a workflow perspective, you enter your cryptomator password to open the encrypted folder and then you will enter your Keypass master password to open Keypass. If you are lazy, you can save the Cryptomator pass so it opens every time and just enter the Keypass password. This is particularly helpful for phones.
Sidenote: I am not affiliated with any of the above. Just a happy user that it all works so nice together -- and across my many devices.