From a New York Times analysis by Maggie Haberman headlined “A Diminished Trump Meets a Damning Narrative”:

As the summer and the House Jan. 6 committee’s hearings began, former President Donald J. Trump was still a towering figure in Republican politics, able to pick winners in primary contests and force candidates to submit to a litmus test of denialism about his loss in the 2020 election.

Six months later, Mr. Trump is significantly diminished, a shrunken presence on the political landscape. His fade is partly a function of his own missteps and miscalculations in recent months. But it is also a product of the voluminous evidence assembled by the House committee and its ability to tell the story of his efforts to overturn the election in a compelling and accessible way.