So after WM39, it seems the next year was all about building a rematch for the following year until... The Rock returned!
Whether it was a pivot or all planned, the rematch is locked in. Reigns retained at 39 thanks to the interference from Solo Sikoa and whilst Roman went through more challengers for his WWE Undisputed Universal Championship, Rhodes had three tussles with Lesnar with their final match at Summerslam 2023 seeing latter lose clean and publicly put Rhodes over post match.
There's a feeling WWE want Reigns to keep the belts until Summerslam when he will break Hogan's record for holding the championships and Rhodes could finish the story, at Madison Square Garden, in November's Survivor Series.
Reigns has had an historic reign but I'm not sure he does so at Mania, I think Cody wins with help from The Rock thus setting up the WM41 main event.