Account
How can I block or stop someone from continuously figuring out my passwords and logging into a device that is not mine?
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You can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.
Link to contact Apple Support in the article.
Apple ID has been compromised. https://support.apple.com/en-us/HT204145
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.
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
Based on what I have read, I suggest you leave your Apple ID email address as a 3rd party email address because you have more flexibility if you need to change the email address. For example, if the Apple ID got compromised, you can change it to another ad