Hi, Berat Uzunpolat.
Thanks for your response.
Community members do not have access to anyone's Microsoft account information or the right to do anything with anyone's account.
When users need to perform account operations, the standard process is to use security verification methods and account recovery forms.
This is difficult for anyone to accept, but I hope the information provided above will give you a better understanding of your Microsoft account security policy.
If you know that your email address has been changed and your Microsoft account has not added two-factor verification, you can try to fill out the recovery form.
Help with the Microsoft account recovery form - Microsoft Support
When filling in the form, please fill in as much content as possible, including user nickname, login region, recent Skype contacts used, Xbox console hardware ID, and passwords used before. Please note that you can submit at most twice a day.
You can then enhance the security of other accounts by using passwords that are a complex combination of uppercase and lowercase letters, numbers, symbols, etc. and setting up two-factor verification, logging in without a password, adding a mobile phone number, adding an alias, etc. to enhance account security.
Best Regards.
Capoo - MSFT | Microsoft Community Support Specialist