RinVa, I agree with your post, too.
I would think Mr. Trump to be too old to run again in 2024. I sense he would have to take good care of himself between now and then.
But having said that, something else he could do "in retirement" is to create a "new media", perhaps a cable news network that would lure traditional-minded folks like Tucker Carlson, etc. He has the monetary means to do so. This could become an important legacy to leave behind, with more impact than any building he could have put up...