Impeachment. But according to Liz Cheney's book, many Republicans agreed with the conclusions of the J6 Committee, but they were too afraid of the repercussions they would face from TFG if they said so publicly.
And then there were the ones who helped plan January 6th and those who gave Capitol "tours" beforehand. We heard that there was going to be an investigation into that, but we're still waiting. Not to mention, tourist visits to the Capitol were prohibited at that time due to the pandemic - so it should be fairly easy to figure out who violated that order.
And all of TFG's investigations into the election concluded he lost, of his 62 lawsuits he lost 61 and even his closest advisors tried to tell him he lost, so he had to know, but has persisted in his lies. 
Edit history
= new reply since forum marked as read