how do I change my primary email address on my apple id
I have a couple of old email address on my apple id.
How do I change my primary email address on my apple id from a xxx@icloud.com to another email address?
You can't change an @iCloud.com to a third party email address.
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.