I can't change my Apple ID
Why I can"t change my apple id from one email address with another. It says that is not available and no one else is using it for another account.
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From: Change your Apple ID - Apple Support
"If you see a message that the email address you want to use isn't available or is already in use, check that you or a family member aren't already using that email address with a different Apple ID. If a family member is using that email address, remove it from their account then try to use it."
Although this next section discusses email address re-use in the context of deleting an account, it supports observations frequently posted on this forum about not being able to re-use an email address as an Apple ID once used previously as an Apple ID:
From: How to delete your Apple ID account - Apple Support
"Can I use the primary email address for my deleted Apple ID account to create a new Apple ID or with another existing Apple ID account?
No, once your Apple ID is deleted, you can't use the email address that you used with it to create a new Apple ID. In addition, you can't use that email address with another existing Apple ID except as a rescue [notification*] email. Also, if your primary Apple ID email address is with a Custom Email Domain, it can never be reused to create an Apple ID after your Apple ID is deleted, even if the domain ownership changes."
* About your Apple ID email addresses - Apple Support
Change your Apple ID - Apple Support says there's a 30 day wait if you want to change your Apple ID to an @icloud.com address that has been newly created.