Since, I won’t weigh you down with Don’s Bloated Essays :), here’s a quick fix:
First of all, you should be playing with Russia Restricted - no questions asked.
Second, infantry are you key to survival. For Germany and Japan, expect to buy nothing but infantry (and matching transports for Japan) for at least the first 4 turns.
Third, Don’t overextend yourself with Germany! This means, at the risk of leaving Ukraine, you must protect Eastern Europe for as long as possible.
Forth, Protect your Luftwaffe! The only risky situation I would place myself in with ftrs is the first turn wipe out of UK’s Navy (also a must).
Fifth, Always remain on the defensive for Germany. (Except for Africa, make sure you can hold that sucker as long as possible until the Japanese can arrive)
Six, For Japan, Don’t buy an IC! You’re much better of with transports. The only IC I might build with Japan is in India and not until at least the forth turn.
Seventh, Don’t expose your ARM (esp. with Germany). Don’t count on buying anymore.
Eighth, Don’t get over greedy with Japan, especially on the first turn.
Ninth, When at Pearl Harbor, it is better to lose a sub or even a battleship than a plane or transport
Tenth, Never play against TM Moses VII when she is using a “Let’s Build Bombers” strategy. You will lose.