Some of the domestic actions should get undone right away. None of these things are “permanent.” Trump can undo them quickly, although a few of them might require help from Congress.
As for the diplomatic damage, particularly with Russia, it might be best to be patient and quietly undo the damage over time. Trump will no doubt have a better relationship with Putin, and they can work things out like reasonable adults.
President Trump will have trouble with Congress as they are filled with dem-rinos like Lindsey Graham and John McCain and Ryan and McConnell and many other rinos who I suspect are being enriched by the monsters of the left who have spent over 10 trillion of taxpayers dollars. Where did and does the money go, I wonder. Is it possible that a goodly amount went to special interest groups of the left and their allies , the rinos. There is no accountability in government now days.