#4 Sheamus

Talking about WWE making a lot of post-Superstar Shake-up changes on this week's RAW, one notable thing was that Cesaro has been drafted to RAW without his tag-team partner, Sheamus, who is still on SmackDown.
While WWE is yet to announce it, but it looks like The Bar is no more. With Cesaro getting a win in his match against Cedric Alexander on RAW, he and his former partner Sheamus could be in for a singles push.
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To make the situation interesting, WWE could play with the character of the Celtic Warrior, either turning him face or making him a ruthless heel. A new makeover for him would also be amazing.
#3 Liv Morgan

The rumor is that WWE has big plans for Liv Morgan post the break-up of Riott Squad and her being drafted to SmackDown.
A fresh character change is something she'll need as fans might not take her Riott Squad character very seriously. A face turn from Liv could also be on the cards, along with a single's push.