#5 Heel Turn - Bayley
Bayley is the quintessential face in WWE. She's always happy and nice and willing to help out others. She had basically lost all of that luster until she moved to SmackDown and won both the Money in the Bank contract and SmackDown Women's title.
Although her tenure on the blue brand has helped her to regain some credibility, once she loses the title, she'll go back to being the same character. Instead of resuming her lovable persona, she should be allowed to explore a different side of her character.
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Turning her heel not only gives her a fresh start but it also opens up several new feuds for her as a heel. She's literally feuded with every heel on the roster and since the depth in the division isn't great, she's battled other faces like her current feud with Ember Moon.
By allowing Bayley to turn to the dark side, she gets a refresher and a reboot that she might need once she loses the title. She isn't going to hold it forever, so once she drops the belt, WWE needs to take her down a different path.