How do I change my @iCloud email to another @iCloud email address without losing my stuff ?

Hey everyone,

I'm trying to basically rename my @iCloud.com email without losing my documents, subscriptions, and purchases. I don't want to create an email alias as those can not be used as primary emails on Apple services.

for example, how do you change JohnAppleseed1@icloud.com to JohnAppleseed2@iCloud.com without losing access to your stuff ?

thanks