Have iCloud vault, forgot password, want to start over w/iCloud sync

I have a Mac, am logged into iCloud, and have 1Password installed. I've forgotten my iCloud 1Password master password and want to delete my iCloud vault and start over with a fresh vault and new master password.

I've tried creating a new local vault and then starting iCloud sync, but the app finds the existing iCloud vault and seems to require that the vaults be merged. In order to merge the vaults I am required to enter the password of the iCloud vault, which I don't remember (as mentioned at the beginning of the post). How can I find and delete/replace the iCloud vault???

1Password Version: 7.7
Extension Version: Not Provided
OS Version: MacOS 10.15
Sync Type: iCloud