My mac doesn’t want to u lock

You are sign in here .  .  .  with your Apple ID & Password (?).

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

See the following Apple articles:

Reset your Mac login password

https://support.apple.com/en-mn/guide/mac-help/mh35902/mac

If you forget your Apple ID or password

If you forget your Apple ID or password – Apple Support (UK)

Sign in with your Apple ID

Sign in with your Apple ID - Apple Support                               

You can contact Apple support for help, -> Get Support (apple.com)

You have to show proof of ownership of your product, provide all documentation showing your purchase of the device.

If you do not have additional proof of ownership, contact the reseller. They may be able to provide the original purchase document.

Once Apple receive your proof of ownership, Apple will further review your request and provide an update.

See if anything here helps.

User Password Reset.   -

User Password Reset (2).  -  

User Password Reset – Apple ID.  -

If you can't reset your Mac login password   *