Deep State = Bureaucratic Inertia
Changing the direction of motion requires overcoming the energy devoted to its current movement. The national bureaucracy is populated by leftists. They have been "guiding" the nation in the direction they want it to go for decades. To overcome the inertia of this movement will require either sudden overwhelming force or less force over a longer time frame. The Left understands this and has been playing the long game for a long time.
There is no eliminating the deep state without replacing the bureaucracy and limiting its future power.