I've said it before, but I'll say it again, as much fun as it would be to have Trump run again in 2024, he'll be 78, and unlike the current dodderer-in-chief, he knows that's too old to be President, and he has better things to do with his remaining time.
That, and his policies have become influential enough within the GOP that the next nominee (DeSantis, probably) will move forward with his agenda anyway.
What would be even more fun is if DeSantis were to become President and he were to appoint Trump to a cabinet position, or as a Czar (border security Czar, perhaps?). What press conferences there would be!