#2 Brock Lesnar - Should retire from WWE in 2021

This may be a controversial opinion, but WWE should not depend on Brock Lesnar in the future. The Beast Incarnate is one of the greats of pro wrestling, but fans may be tired of seeing him come in and be pushed right to the top of the card.
And Lesnar did not quite push the ratings up during his last run with WWE as the RAW go-home show of WrestleMania 36 showed a huge dip in ratings for the segment featuring him and Paul Heyman.
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While Lesnar could help put over younger stars, like he did with Drew McIntyre last time around, there aren't too many challengers in the world title scene on RAW that need the Lesnar rub. The Beast Incarnate's short runs in WWE may also not be enough to have a meaningful storyline with younger stars like Karrion Kross from NXT.
Perhaps the one dream match that Lesnar has remaining is the one with Bobby Lashley. The All-Mighty has been demanding the match for a long time. WWE should pull the trigger on that match later this year, perhaps at SummerSlam, and get it done with.
That could be a great way for Lesnar to bid goodbye to the WWE Universe and put over Lashley, who has looked tremendous since becoming world champion earlier this year.
Lesnar doesn't have anything left to achieve in WWE and this is the perfect time for him to call time on his glorious career.