He needs to got to the states find the talented and honest mid to upper level managers at agencies. A few do exist.
He can go to senior military fired over not getting the vaxx.
He needs to go to fellow billionaires who support him and ask them to allow him to raid their top talent.
He can bring in talented white South Africans.
That is a small portion of the kind of good thinking Trump and his team and closest advisors will certainly consider.
There are many good thoughts by others on this thread. For instance, fruser1's suggestion that Trump install former Internal Affairs LEO's in the agencies seems most appropriate given the multitude of back-stabbers and leakers in D.C.
Needless to say, after his first term, Trump is now smart enough to deep check recommendations offered by those he listens to.
Trump also has reliable patriot friends and connections in both the military commands and intelligence branches, all of whom will be eager to help cleanse the ranks.
Those who predict it will be the "same ole, same ole" Trump are naive or are trolls. The anti-MAGA's greatly fear Trump for good reason.