Quite aware of the myth, there's quite a few clowns in administration that can't get dropped as long as he's around. Hess, Borman, Himmler, Goebbels, Wilhelm Frick, Bernhard Rust, Lammers, et al. His administrative practice of splitting things between various deputies causes endless waste of time and resources, not to mention changing decisions depending on who last talked to him.
There's several generals they have to retire to have a chance of winning on the army side. Keitel and Halder for starters. Let Halder get started on his writing career. Promote Georg Thomas and have him work to rationalize army procurement, 150 different kinds of trucks and motorcycles, 24+ different types of artillery, many types of small arms, four different tank chassis (Mk 2, 3, 4 and T38) all in production. The panzer IV tank has a short barrel 75 MM gun that's useless for fighting tanks, the Panzer III tank has a 37 MM gun that's close to useless, no semi-automatic rifles, useless 50 mm mortars, 37 MM AT guns that can't knock out modern tanks... Quite a few units armed with Czeck and other foreign captured equipment.
Put all production under Todt and Speer, not just army, i.e. Navy, Luftwaffe, SS. Eliminate multiple duplicate projects. Georg Thomas, Werner Fuchs, Wilhelm Wimmer, and Gottlob Berger can liaise with this for each service.
The top of the Luftwaffe could use a few retirements/reassignments as well, put Udet back in the field, retire "we don't need to modernize " Milch, bring back
Wilhelm Wimmer and Wolfram von Richthofen.
Work with Reichsverkehrsministerium
Wilhelm Kleinmann to get the railroads organized for a long war. Work with Reichslastverteiler Dr. Richard Fischer to upgrade power generation and integrate the electrical power of the occupied countries. Bring back Heinrich Brüning at the foreign office.
Retire Erich Raeder. Upgrade the guns on the Scharnhorst and Gneisenau.
The Gauleiters and Kreisleiters cause endless administrative problems and waste, have to rationalize the parallel party apparatus. Stop the Reichserziehungsministerium from wrecking science and education.