Normally, if you still have access to the old address, you add the new address and then swap it to primary. In your case, you probably need to abandon the old account and create a new one to use going forward. I don't know whether you can use the data deletion request to clear your old data without being able to access the email address, but if you want to try it: https://privacyportal.onetrust.com/webform/1350748f-7139-405c-8188-22740b3b5587/4ba08202-2ede-4934-a89e-f0b0870f95f0