It doesn't look like this question has been asked, probably because Tableau Public workbooks are... public, but here goes:
I have a mix of personal and professional workbooks on my Tableau Public account. I am leaving my agency, but I want to ensure that they still have access to the professional content. Is there an easy way to do this, or should I have my agency just download the workbook files to save on a new account? I'm hoping to be as least disruptive as possible.
You can let them download your workbooks (remember that you can set the workbook download option , you can set that to 'No' for all your personal workbooks and after that ask them to download professional workbooks )
May be there are other options but I think this is the feasible one.