How do I delete my email account
How do I change my email account
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See Change your Apple ID https://support.apple.com/en-us/HT202667.
And see What to do after you change your Apple ID or
Password https://support.apple.com/en-us/HT204071 (supplementary to what the fist link says)
Post back if you have questions about what you can do if your Apple ID (1) is a third-party apple ID or (2) ends in icloud.com, me.com, or mac.com.
And FYI, see iCloud: About your @icloud.com, @me.com, and @mac.com email addresses https://support.apple.com/en-us/HT201771
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You can deactivate or delete it. Apple recommends doing the first for the obvious difference noted below.
How to deactivate your Apple ID account https://support.apple.com/en-us/HT208503
If you request account deactivation, you'll receive a unique alphanumeric access code. When you're ready to reactivate your Apple ID, contact Apple Support, provide your access code, and we’ll help you reactivate your account. If you lose this code, we won't be able to help reactivate your account."
How to Delete your Apple ID Account https://support.apple.com/en-us/HT208504
“While your request is being processed, you can contact Apple Support with the unique alphanumeric access code you received, and we’ll help you cancel your request. After your account is deleted, Apple can't cancel the request, reopen your account, or restore your data.”