Forgotten password
If you control the recognised contact channel, follow a legitimate reset instruction.
Remembering an account name does not mean you control its recovery channel. Check whether you can use the relevant email or phone. Losing that channel may require its provider's own recovery process.
Creating a new account does not restore the old one. Note the previous details and when the problem began. Repeated attempts can make it harder to identify which request is current.
Unexpected changes should not be treated only as a forgotten password. Secure your contact channel and record the suspicious event's time. Do not trust a person promising restoration in exchange for money.
Consider these situations separately before deciding how to proceed.
If you control the recognised contact channel, follow a legitimate reset instruction.
Understand the relevant contact provider's ownership recovery process first.
Record changes you did not make as a security concern.

Note when the problem began and the last normal access. Relevant message text can help. Provide a sequence of events rather than complete secret credentials.
Someone requesting passwords, codes or advance payment in private chat is not automatically part of a legitimate recovery process. Do not grant remote device control. Verify the destination before following new instructions.
This page explains recovery and is not an active password reset system.
The result depends on the actual service's identity and contact conditions.
Stop payment until the request has been verified.
Describe symptoms, time and whether you control the contact channel, without secret codes.