if a user is not in the sudoers login as root and edit your /etc/sudoers. look for the line that starts with “root ALL =…” copy and paste it below with root replaced with your username

edit: nevermind I missed the part that said disabled the root account. that’s weird not sure why you wouldn’t be able to access root unless maybe a typo during password creation

You are my first upvote and this is my first comment