[Plugin: Advanced Access Manager] Lost full Admin access

I’m so screwed…

I had Advanced Access Manager plugin installed, but other admins had issues in accessing all function in the admin panel – specifically Users. I deactivated and then removed AAM, but it left elements of the SuperAdmin role in place and other admins could still not see Users.

So, I tried a fix I saw which added:
$wp_roles = new WP_Roles();
$wp_roles->remove_role(“super_admin”);
to the functions.php file, added this to my child theme and reloaded the site. The site is fine, but when I log in as an admin, I have now lost access to key parts of the admin area. So, no-one can edit things like the Users in my site.

Is there a fix I can make to the database that will allow me to get rid of this, now hidden, Super admin role?

Steve