How do I change my iCloud email without changing my Apple ID?

You can create an iCloud mail alias for existing Apple ID that is signed in iPhone Add and manage email aliases for iCloud Mail on iCloud.com - Apple Support

ahamedashbal Said:

"How do I change my iCloud email without changing my Apple ID?: My existing email ID is [...], I’m interested to change the mail ID, highly expecting a reform"

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Changing the iCloud Password:

You can't. Once created, the eMail address is what it is.