#3 Liv Morgan

On her WWE return during the last RAW of 2019, Liv Morgan was revealed as Lana's secret lover during The Ravishing Russian and Bobby Lashley's feud with Rusev, which went nowhere. While that storyline didn't help her cause, it seemed that Paul Heyman had big plans for Morgan at one point in time, given the booking that the latter got following WrestleMania 36.
Liv Morgan was doing reasonably well in her few matches on RAW and looked solid in defeat against Charlotte Flair. Her mic work had improved significantly too. Thereafter, she has started missing a good chunk of WWE programming and reports are now suggesting that the company has pulled the plug on Morgan's push as a singles competitor.
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WWE has seemingly paired her with Ruby Riott again, but it doesn't feel that the duo will have a prominent role to play on RAW. With three or four already established female tag teams, Morgan could be in for a frustrating run on WWE TV.