After seeing Trump go through the Stormy Daniels trial and being painted as the greatest villain in the entirety of U.S. history, the so-called supporters of Trump (whose numbers seem to be increasing day by day) might have had enough of Biden being president.
Being consistently painted as white supremacists and Nazis by the left for merely being a supporter of Trump further drives more and more people who don't support Biden and the left-wing political actions to the other side.
All the efforts to send Trump to prison, including bringing in a former pornstar who slept with Trump for hush money, and the Jan 6 incident (which actually didn't cause much physical damage to the Capitol building, unlike the George Floyd riots), made the grand jury's actions look like political persecution instead.