I changed the name of the poppy user without renaming folders, and he does not accept passwords, how to fix it?

Question

macOS

I decided after the purchase to change the name of the poppy user through "Users and Groups", changed, but did not change the names of the folders. Now it does not accept either the password or the username, and when I want to rename the folder from the default macbook to my own, it says - macbookpro is not in the sudoers file. This incident will be reported.
What to do?)