#3 Expand his moveset
Roman Reigns used to get heavily cheered during his Shield days, and his limited move-set didn't come to the fans' notice at the time. Soon after The Shield imploded, Reigns went his own way and fans suddenly realized that he had a limited move-set, contrary to his former teammates, who were incredibly versatile in the squared circle. This, and the fact that WWE wanted the fans to hail him as their new hero wasn't something that thrilled them.
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A great idea for Reigns here would be to add several new moves to his repertoire. One of the most polarizing Superstars in WWE history, John Cena was hounded by the fans for his "5 moves of doom". Reigns adding a variety of new moves to his set would be a big plus for him going forward and would help him improve as a wrestler.