#3 Re-run old feuds for Seth Rollins
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Two of Seth Rollins' biggest feuds in 2020 took place against Kevin Owens and Rey Mysterio. While he also challenged Drew McIntyre for the WWE title, it was a one-PPV rivalry, meant solely to establish the Scotsman as the face of RAW.
WWE sometimes has a habit of having Superstars return and then getting into old rivalries. While it would make sense if there were a reason to get back to it, there isn't in this case.
In terms of the Rey Mysterio feud, the best thing that came out of it was Dominik Mysterio making his debut against Seth Rollins at SummerSlam. It started well, but it went a bit downhill after the feud went to SmackDown, and they began a Murphy-Aalyah Mysterio romantic storyline.
With the Kevin Owens feud, it ended as it needed to. They had a blow-off match at WrestleMania, and Seth Rollins put over the former Universal Champion. When Seth Rollins returns, he needs to be paired with a new opponent.