This was Trump's Achilles' Heel. The Dunning-Kruger Effect.
He concluded that, because he was a great businessman and knew his way around governments from a business point of view, he knew the political world and how it works.
He is a very fast learner, but one cannot accumulate wisdom as fast as one accumulates knowledge.
He was easy prey for the Deep State he had set out to destroy.
If he were to return in 2024 a chastened and humbled President, with a clever understanding of his enemies gained by painful loss, he could still win the war.
Remember, FDR and his Advisors didn’t even tell Vice President Truman about the Atomic Bomb Project.
Truman found out about it when he assumed the Presidency.
POTUS Trump was an outsider, not part of the DC filth. For all intents and purposes he was the real live version of Mr. Smith goes to Washington.
He had to depend on the advice of the Republican Politicians that surrounded him. Who else could he depend on to help build his Administration?
For all the grief people here give him, he had to start from scratch working in a system he was completely unaware of.