Hello ziraeal,
Welcome to Microsoft Q&A forum.
It's unfortunate to hear that your account has been hacked. However, this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas. In this case, since the email has been changed, the account is likely not recoverable. However, you can still try to submit a form at aka.ms/recovermyaccount if you haven't done so already.
I understand that this is not the results you expected, however regarding the access limitation, this is the best I can do as a forum moderator. Thank you for your understanding.