Account
How do I change t email my account has been hacked twice
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Note the restrictions in the article.
Apple ID Name Change. https://support.apple.com/en-us/HT202667
What to do after you change your Apple ID or password - Apple Support https://support.apple.com/en-us/HT204071 I suggest doing this before you change your Apple ID or password.
You can also add 2 Factor Authentication to your account for more security.
Apple ID -Two-factor authentication https://support.apple.com/en-us/HT204915
Two Factor Authentification availability. https://support.apple.com/en-us/HT205075
Apple ID - Using app-specific passwords. https://support.apple.com/en-us/HT204397
Apple ID - Two Step Verifications FAQ https://support.apple.com/en-us/HT204152