Trump became wealthy in one of the toughest real estate markets in the world, so I can understand why he developed the habit of striking back at critics with razor-sharp elbows. But winning the hearts and minds of undecided voters is an entirely different game that requires a far higher level of finesse.
American politics has never seen enthusiasm like that generated by Trump in 2020. According to Wikipedia, Trump held 66 campaign rallies in 2020. The few rallies Biden held had embarrassingly low attendance, while Trump drew absolutely MASSIVE crowds.