Two things are ultimately going to cripple this administration (if it hasn’t already occurred).
1. When you run as a political novice and outsider, you have no natural allies. Trump can forge temporary alliances on some issues, but there is no one truly committed to his success with the possible exception of Bannon, who has no allies himself. Even if Ryan and McConnell and McCain and Flake and Murkowski and Collins vanished tomorrow, they would be replaced by people with no relationship with him and different visions.
2. When you have no natural political allies, it probably makes sense to reward those who were extremely loyal to you personally at any point. Ask Christie and Sessions and Preibus (who shut down every anti-Trump movement at the Convention) and Flynn, and, I guess, Scaramucci how that worked out.
How about ya stop firing the people who have your back? How about ya start hiring the people who helped you through the election and worked tirelessly? How about ya get rid of Obamaunists and NeverTrumpers.