The problem with all of those possibilities is that with too many candidates splitting the primary votes, Trump could win the nomination again. I think I read somewhere that all in all, he only received 40% of the primary votes in 2016 and then went on to lose the popular vote in the general election. He won the primaries because each state was winner takes all and he won the general election thanks to the Electoral College. Trump is right about one thing - the elections are rigged - in his favor.
And you are right that even his supporters are getting tired of him. The problem is that they say that they are tired of him but then in the next breath say that they will vote for him in 2024 if he runs.