#6 Becky Lynch

This one isn't much of a surprise, but 'the Man's' masterful work on the mic and in the ring during 2018 helped to propel her to the top of the WWE. She was arguably the top star since Survivor Series of 2018 and further proof of that was the main-event slot of WrestleMania 35.
Mr. McMahon wasn't going to let any woman main event his biggest show of the year, so he must have really bought into Lynch's work over the last year and a half. He was already a huge fan of Ronda Rousey because of her cross-over appeal and Charlotte Flair because of her pedigree. Lynch had to work twice as hard to get to where she currently is and will have to work even harder to continue to sit atop the women of WWE.
Lynch might lose one of her titles at MITB but she's not going to lose both titles soon. She'll likely hold one at least through SummerSlam. If they picked her to walk out of the first women's main event of 'Mania as dual champ, then they aren't going to book her to lose both titles sooner rather than later.
Because of that, Lynch will probably be heavily featured on both shows until someone cashes in their briefcase on her. Giving Rousey her first loss in WWE was almost as big a deal as breaking the Undertaker's streak or beating Lesnar, so expect the man to dominate going forward.
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