At least 45-46% are still going to vote for him no matter what. That's the sad but hard truth.
Any Republican Nominee will get 45-46 % because of the increasing polarization in the Country.
Even John McCain got 46 % YET he lost the Electoral College in a landslide.
If 57% want to get rid of Trump once and for all, perhaps just vote for Biden in the GE, if you can't beat Trump in a primary?
I’ll never vote for Joe. Worst case scenario, if Trump actually does something real bad and unacceptable (which hasn’t happened), I leave the Presidential section blank and vote R downballot for Congress, etc, so that Joe doesn’t have another trifecta if he does win.