#4 Not using the entire roster
The photo above represents a pretty stacked lineup of stars. From top to bottom, WWE is stocked full of talented performers. Many talented men and women have carried the company for the past decade. While a select few are usually allowed to represent the company at the top, the entire roster is full of performers who could be stars if given the chance.
Look at the men and women above. Seth Rollins, Kevin Owens, Drew McIntyre, AJ Styles and Randy Orton are all main event stars. The future is bright with wrestlers like Aleister Black, Andrade, Buddy Murphy, Ricochet and Cedric Alexander waiting in the mid-card.
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Women like Becky Lynch, Charlotte Flair, and The Kabuki Warriors are likely going to be treated as the top women on the brand. Many of the other women (The IIconics, Sarah Logan, Liv Morgan) are just as talented, but need a prolonged chance to show it. Not everyone will be pushed to the moon, but some talents like The IIconics, Logan, and Morgan could see some more favorable booking.
Many stars have started to get time on either RAW or SmackDown with the rosters officially set following the WWE Draft. Stars who haven't had extended pushes, like Buddy Murphy and Humberto Carillo, are starting to get pushes on RAW. The more the WWE Universe sees of WWE's underutilized talent, the better.
Shorty G has gone through an up and down past few months, but it has led to a big singles push for the former Chad Gable. Each post-draft episode of RAW and SmackDown has done a decent job of highlighting some new talents, and creative should continue that trend.
One way to further utilize an extremely deep roster is to form more factions. It's an easy way to get more people on screen and to book storyline feuds. The OC is going to need more groups to feud with and teams like The Viking Raiders and The Street Profits have needed a third person to go to battle with. Another way to get more people on TV is to only book one or two short segments per show in order to give more people air time.