I do not believe that other than a few high profile people that there really are more than a tiny percentage of people who are still “Never-Trumpers”. Most of the people who said that they were last time have fallen into line because President Trump has proven with his policies and court appointments that he more a man of his word than most Republicans.
Ben Shapiro did not endorse Trump last time around. This time he is all-in - if you check his YouTube channel from the last couple of weeks especially. Millions watch his channel and listen to his corresponding podcast collectively - that will probably swing some more votes that were not in his corner last time around.