I can't reconcile your concern over the disregard for the Constitution in the other thread with your desire for Trump to take unconstitutional action in this thread. The actions you seem to have wanted are reserved for the states.
Trump's administration did what could be done to assist in getting a vaccine developed. I think he should have stopped international travel faster and more thoroughly, but he was already accused of xenophobia when he did do it, by many of the same people complaining now that he didn't do enough. The media outrage towards DeSantis while they fellate Cuomo and Newsom reinforces that this is primarily a political concern, actual results are secondary at best.