Hi Aplcomeon, Hope you are doing well. What you can do it to restart your Mac and boot from a Single User Mode by holding "Command + S" All you need to do is to type this command:
/sbin/mount -uw / (Enter)
rm /var/db/.AppleSetupDone (Enter)
reboot (Enter)
This command will create another admin account in your Mac. After creating another Admin, you can go to System preferences - Users and groups - and promote the standard user to Admin by Selecting your previous Account and Select "Allow use to administer this computer"
Hope it helps. Cheers!