Hey there! Nice to meet you!
You can try using the username lookup from this link: https://support.microsoft.com/account-billing/forgotten-your-microsoft-account-username-b2049472-3b8f-27d3-61c6-67a668453f4c
However, the system can only show you a hint of the username once you have provided the verification codes through the account's security verification methods.
If you aren't able to locate your username, please try finding your Microsoft account username in other products or services associated with that account through this link:
If you're able to locate the email address/username and you have access to the linked verification methods, you can reset the password on account.microsoft.com > click "Forgot Password" > Verify your identity by providing the verification codes > then reset the password.
If you do not have access to any verification methods, the only way to recover the account is through the account recovery web form: https://account.live.com/acsr
Important: If you have an active 2FA, ACSR will inform you that your recovery request will be ignored. If you only receive a message that the recovery request is either successful or indicates insufficient information, this means that 2FA is disabled.
You'll need to keep trying until you're verified by Microsoft, and you can do this up to 2 times every 24 hours.
If your Microsoft account recovery request was not granted, please review this link for tips on improving your chances of a successful recovery: https://support.microsoft.com/office/dc56c3e3-dff0-4ed5-8edb-60290eea6b53
Please be advised that Microsoft Support will not be able to grant you access to your account.
Thank you for your understanding.
Best regards,
Darhyl