#2 The Bella Twins

The Bella twins made quite an impact in 2018.
Not only did Nikki Bella almost eliminate Asuka to win The first ever Women's Royal Rumble, she also went one on with Ronda Rousey and had a hell of a match. As for Brie, she and her husband, Daniel Bryan, took on The Miz and Maryse at Hell in a Cell, which was a huge highlight for the Yes Movement.
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Beyond all that, Nikki and Brie Bella had the segment of the year when they turned on Ronda Rousey during an episode of Raw, which would later set up Rousey versus Nikki Bella at The Evolution pay-per-view. In fact, the match headlined the first ever women's pay-per-view and that's a huge accomplishment for everyone involved.
In the end, The Bella Twins have seemingly accomplished everything there is to in WWE and their accomplishments reflect that. Furthermore, they probably have enough money set back and enough powerful brands together that they won't hurt financially. If nothing else, the girls deserve to retire after a decade of hard work and very drastic effects on their bodies.
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