I think President Trump should have a website where all the evidence for voter fraud that has been publicly presented in courts or to legislatures is listed in as much detail as possible. For sworn affidavits from people who ( understandably) want to remain anonymous, just give them numbers, like Witness 1, Philadelphia, Witness 1 Pittsburg, etc.
There are two battles here: one for the right to serve a second term that he won on November 3rd; and the battle to have the legitimacy of his victory recognized in the court of public opinion.
Our media views it as their job to drive us insane. But we are not all crazy. After all, Trump seems to have won EASILY. It was not close, despite a media—notably social media— led propaganda offensive without an equal in American history.
Make the evidence obvious and easily accessible and digestible by people of average intelligence.
Assuming he does get reinaugurated as he deserves, I think President Trump should create a website listing his accomplishments. That would suit his personality well and serve the concrete practical end of reinforcing daily his competence and successes in the eyes of voters.