Hi, I'm Bernard. I'm happy to help!
Unfortunately, you cannot close the account without knowing the password. In this case, I recommend following the steps below to recover your account:
Method 1. Recover a Microsoft account by resetting the password:
Go to this link: https://go.microsoft.com/fwlink/?linkid=2273955 and follow the prompt to reset the password.
For reference: https://support.microsoft.com/en-us/account-billing/reset-a-forgotten-microsoft-account-password-eff4f067-5042-c1a3-fe72-b04d60556c37
Method 2. If you cannot reset the password or are unable to verify the account, I recommend submitting a recovery form:
https://account.live.com/acsr
Please complete the form and expect a reply within a couple of days.
Note: This is a public forum. I may respond shortly, but I apologize in advance for any delays. I am simply a fellow user trying to provide helpful insights and information.