Other good speakers as well (Pompeo, DeSantis, Noem). It might be worth hearing what POTUS and the others have to say. I don’t know who will be broadcasting it as yet, will update in comments if I find out. Just an FYI (and apologies if this has already been posted. Without a search function duplicates are inevitable).
https://thepalmierireport.com/trump-to-deliver-keynote-address-at-rnc-donor-retreat/
Trump has chosen to try to reform the Republican Party rather than start a new one. He may be making some headway, given the list of speakers here.
He probably sees a possibility of bringing the Republican party back from the ashes now that he has taken control of it and has won over the very voters who put rhinos like Mitch and others in the senate and house in elections prior to 2016.
Here's hoping it works. It probably would be easier to do that than try to overcome the third party barrier that seems to naturally exist within our system.