Hello, thank you for reaching out to Microsoft Q&A.
If you did not have 2FA active on the account, and the account was not deleted due to inactivity, you will need to try the Account Recovery Form: https://account.live.com/acsr
Remember to use a familiar device from which you've frequently accessed your Microsoft account, as well as a familiar location. Microsoft will review your responses and respond within 24 hours. If you are verified, instructions on how to log back into your account will be sent to you, and if you are not verified, you will need to submit the Account Recovery form again. You can do this up to 2 times every 24 hours.