Device access
How do I secure my Apple ID and all apps associated with my device from a previous partner? My passwords change daily and have had my service suspended apps limited. It’s almost like he has a device or watch that mirrors my screen.
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.
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.
Apple ID -Two-factor authentication
Two Factor Authentification availability.
2 Factor Authentication - How to generate a recovery key
Apple ID - Using app-specific passwords.