Now before people latch on and say "you have TDS, you're just a leftist/RINO supporter" let me preface this, I do think he should run and win being president, but the way he is doing it is wrong.
I think he should run as an independent
The people vote for HIM, not the Republican party, if he came out in the speech saying in his own way "I cannot trust or respect the leadership of the Republican party especially when they denied funds to many in the midterms, so I am running independently until that trust can be earned". This would do a lot:
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Deny funding from the MAGA supporters to the Republicans, they'll still have their interest groups but now can't mix the money with grandma's donation.
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Bring more focus on the leaders like mitch because they've now been openly challenged
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Kill any hope for a Republican nominee, anyone trying to run between Biden and Trump would be committing political suicide so those suspicions of Desantis, this will be the ultimate test if he can see the trap. And since he's independent, they cannot screw him in the nomination process.
Just my thoughts, still concerned that Trump doesn't have the best advisors still and not making moves like this .
Unfortunately the current party system is a brain parasite that controls American electoral process. It has become one with the host, and there is no way to safely remove it. GOP and DNC are two heads of the same creature. I'm not sure how people see the cheating or even simple lack of support that the GOP engaged in to stop Trump and other MAGA candidates, and think it won't be even easier for them to fend off a complete outsider when the GOP and DNC are openly working together. It's almost impossible by virtue of law, culture, and power.
I say almost because if anyone could pull it off - it would be Trump. He would have to treat it not as an (I)ndependent run, but as the culmination of a hostile takeover and rebranding of the old party. He would require support of incumbent GOP politicians in every competitive state leaving the party to go with him to the new one. He would need to fight against accusations of being a spoiler, and force people to see the old GOP as the spoilers. He would need wealthy and influential backers who currently support Republicans to shift their support to the new team. He would need all of us to work at the grassroots level to pressure our friends, family, and representatives to support the change. "Don't worry guys it's really just the new Republicans. We aren't splitting the party, we're throwing out the RINOs!" We would need enough power to change local and state election law and how machines are programmed to not favor a binary system. (or replace the old party with the new one) We would need well-known local politicians to run on the new name so grandma can still vote straight ticket - and remind her that R is now A or M or whatever. We would need coordinated mass resistance against well-funded Con Inc. media fighting against us the whole way.
At the same time, Team Trump would need to bet on the mainstream media publicizing all this hype of a new party and infighting enough that default Dem normies DO see it as a fresh choice, and no longer associate Trump with those smelly Republicans. He would need to invoke that same kind of Maverick energy that made people think 2016 was impossible until it wasn't, and made the GOP brush him off until it was too late to stop him.
It might have been achievable if he said he plans to do all that in two years. But he didn't, which tells me he doesn't think it's possible either. So I'll assume he knows what he can or can't accomplish more than the rest of us.
Which is unfortunate as the reason I suggested this is like you said if there's one guy that could pull off an independent run, it would be Trump. If he could pull it off once just for precedent it feels like it might provide a large enough crack in the uniparty that exists that they spread out too thin trying now stop independents to be effective.