First they throw away their 6th research slot, have a look at the emigrated Nobel laureates alone. And people like Nebel, the father of rocket science (and probably more competent than sunnyboy v. Braun)
Then they started to replace/marginalize the very best military high command like v. Fritsch(+), Beck, Wever(+) or Richthoffen with yesmen and/or drugged clowns like Keitel??, Jodl??, Göring???, Udet???? and Raeder...?
They replaced a sober Staatsräson with some abstruse ideological considerations (extreme nationalism
didn't work without racism, btw)
Notabene: The consens about rearmanent was still strong, alone about the tempo were disagreements.
So start as land power for example building capital ships, without a) having the fuel, b) having the money, c) having the steel? Which further complicated the relationship to Britain unneccassary at that moment?
Since Clausewitz there were some basic strategic considerations: As a nation without natural borders in the centre of Europe you should avoid a multifront war.
As a nation with limited recources you must avoid a longish war of attrition.
"Russia could only conquered out of her interior", Clausewitz. Ludendorff understood that in 1917.
And a bitter experience from 14/18: The US will follow the money. They will not allow you to crash Britain, because otherwise Britain couldn't pay her dept.
Instead of investing in strategic relevant railways and industry built Autobahn..., stop, that was not a mistake, ok, ehm, built a obscure bomber fleet for political reasons (think how many ICs your starting bombers are worth?).
shall I continue?
btw, I gave you a like for your last statement.