@cwmoss Plans cannot be transferred but you can certainly copy over elements and data from one app to another. You can cancel a monthly plan and then subscribe to a plan on another app. See this post for transferring apps.
In your Google account, remove Bubble from ‘Third party apps’ or ‘signing into other sites’. Then back in Bubble, you can click ‘forgot your password’ to send a reset link to that email. Once you have reset your password and you are logged into your account, you should see a clickable ‘change email’ link in https://bubble.io/account .