Hello, onur guner
Welcome to the Microsoft Community.
Please understand this, as Microsoft is very protective of the security and privacy of user accounts. For account data, no community member can access the server's backend data to restore it. Account data is stored on highly encrypted servers, and very few people have access to these servers.
For your current situation, filling out the account recovery form is one way to try to regain access to the account. Of course, you need to use an accessible work email account. And fill in as much information as possible about any Microsoft services that this account might use. The more information you provide when filling out the form, the better the chances of regaining access to the account.
If you have questions about where you are logged in to your account, you can check for any unauthorized access by logging in to the Microsoft Account website at account.microsoft.com and clicking on “View My Login Activity” on the Security page.
Please feel free to contact me if you need any further assistance or have other questions.
Best regards
Cece | Microsoft Community Support Specialist