#4 Turns face, defeats Dean Ambrose in a feud

If WWE wants a credible face superstar in the mid-card of their singles division, Sami Zayn can perfectly fit in that role. RAW has a lot of heels currently, like Drew McIntyre, Baron Corbin, & Bobby Lashley, and they need face superstars to battle with.
So, Sami Zayn, who used to be a face before turning heel in 2017 can once again embrace his face side as his heel character was not that successful.
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To establish him as a top face superstar, WWE could insert him in a feud with Dean Ambrose who is leaving WWE soon and is expected to put over some talents before he leaves. Maybe a short one-month feud with Ambrose, with the duo facing off at Fastlane, could provide a good amount of momentum for Sami ahead of WrestleMania 35.