Do you not remember the Microsoft account used on the PC, if so, log into any Microsoft account you may have, then go to the Devices section, in there, if you see the PC listed, that is the Microsoft account used to log into WIndows on the PC.
If you are still unable to reset the password to log into the PC, then because this is a Microsoft Forum it is against the Code of Conduct for us to provide a method to bypass a Windows Password, I hope you understand.
The options you then have is to Reset Windows, or clean install Windows from a bootable USB