Hi! My name is Aj and Im an Independent Advisor here to help! To close your account kindly follow the steps here https://support.microsoft.com/account-billing/how-to-close-your-microsoft-account-c1b2d13f-4de6-6e1b-4a31-d9d668849979
Kindly take note that "As stated in the Microsoft Services Agreement, once your account has been closed and the re-open window has passed, Microsoft will delete your Data and your Content."