In Cleveland they brought Van Pelt, Aaron Rodgers' favored coach, in to work with Mayfield. Van Pelt tore down all Mayfield knew about being a QB, had his ability to option plays taken away and taught him how to read defenses. He changed his footwork to increase his accuracy to a professional QB level. He worked with him on technique, play designs and understanding the playbook.
If Mayfield maintains the changes he worked on with Alex and has a good attitude about this (!! I got away from the Browns 💩 !!) he will be successful.