There's plenty of just cause for resenting the DOJ, DOD, CDC, and a host of other agencies which conspired to make his tenure more difficult, and even the courts that I am 99% sure allowed it to be unfairly terminated.
But if he wants to win, he has to get back to a more positive message, about rebuilding America, about reversing the damage hat has been done through COVID and beyond, and about stopping the Green New Deal we are having foisted upon us all. Get back to staying out of wars, rebuilding our economy and energy security, and putting America First.
Negativity only motivates so many people for so long and then they burn out.