How to know my password when change password with "net user xxx " no quotes and "/add"

system: windows server 2012.

command: net user admin abcd@efg.

environment: Powershell.

After I changed my password, I cannot sign in my system.  How to know my password now?

Thanks.

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/cc771865(v=ws.11)

https://shulerent.com/2015/08/20/windows-net-user-add-password-with-special-characters/