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Hi, good day!
I recognize that this is a challenging situation, and I want to give you good news, but the truth is that it can be difficult to get your account back, and it could be lost forever if the hacker changed your email address and other details. I suggest your check the Sign-in helper tool in the support article below on How to recover a hacked or compromised Microsoft account.
You can use the website to get detailed instructions on how to recover a compromised account, and as a last option, you can talk to a Microsoft Support agent.