so, first a better command system as united high command which have the same eccuracy as Stavka, Shaef or Grand Quartier General during the WWI.
identified goals need reals ways.
forget the lucky strike strategy.
fist german beat the foot soldier ie France
then they take the risk to invade England whatever is the cost
second a real work for Uboat during 1940 1941 years
third they must not stop Panzer building during summer 40
you can forget too the Halt Befhel nearby Dunkirk and capture 200 000 tommies and the England is out of game as the french are in june with their 1.200000 POW and 120 000 KIA (2000 per day)

in all case they have the possibility to win in afrika what is the sacrifice of one or two FallSchirmjager Rgt for the control of malta ?

better organisation for Barbarossa, not a blinding invasion. I'm so sorry (it s little frenchy "vengeance" we lost with good tank as Somua 35, we made campaign with poor vehicule too H35 etc, do you think that attack USSR with 600 PzKI or PzkII is the sign of brightness mind ? )

send unit as replacement and not as renforcements as PzK in russia or PzBrigade in France, to renforce cadre unit instead to fight as fresh but green units....

and finally accept that is not poker but war, building a coherent strategy and asking sacrifices to the population. working during night, femal working, not stopping train for ostfront for Xmas etc etc as english, americans, russians did it....(for us, we are not in battle for a too long time to do it ...)