#4 Drop the Superman persona
The character of a super-powered hero who could make a comeback after enduring the worst beatings is something that worked way back in the 80s when Hulk Hogan was on top. As time changed, fans began hating the idea of such a character, and hence it resulted in John Cena getting booed for the better part of his career. His transformation from a cool heel to a generic babyface didn't sit well with the fans.
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The same thing happened with Reigns, who was the anti-hero Shield member and was loved by the fans at first, but soon garnered hate after getting pushed to the Moon post the Shield implosion. Roman Reigns needs to make sure his character looks and feels believable to the fans. The Superman persona would have worked around 4 decades ago, but it just won't get over in 2019 with today's generation.