1. Test your Torpedos and magnetic detonators in various sea areas rather than just the Baltic. Change in magnetosphere, water density and temperature impacted Torpedos to the point that almost a year of submarine warfare was lost due to faulty equipment. It was still successful overall, thanks to Deck gun and lack of Allied preparation but loses could have been far far worse if proper testing was done.
2. Split Czechoslovakia with Hungary to win them over.
3. Provide far greater aid to Finland during the winter war to indebt them to you.
4. Don't trust Sweden's neutrality. Their supply of information to the British often caused disasters in the Naval department.
5. Explain your plans and reasoning for invasion directions on the Soviet union. Explain the oil situation to the Generals, explain that the time is running out, explain that France and Soviet Union are two different beasts and that taking Moscow does not win the war.
6. Eliminate Canaris, flush Abwehr down the drain. There was no saving it, it was so compromised that nothing could be done with the assets that are already part of it.
looks pretty good for Nazi Germany, though i have some questions
1. There were not enough subs. Even if every torpedo fired by U-Boats worked, there still wouldn't be enough of them to make a big enough impact.
2. You mean give Slovakia to Hungary right? They had a pretty short war in March 1939 where Hungary almost crushed Slovakia. If Germany supports Hungary then the Slovaks are screwed.
3. Germany can't really give anything to Finland. They are still under the MR treaty, which gave Germany the raw materials it needed to stay alive. Though covert assistance (the CIA type) is not ruled out though. But overt assistance is definitely a no.
4. I agree. Sweden was playing both sides in WW2. They sold iron ore to Germany and intel to the UK. Typical behavior for a country stuck between a rock and a hard place.
5. I disagree on this point. The Germans could never hope to get to the Caucasus by winter 1941. Moscow is far better, as its a rail hub, transport hub, symbolic city, and home of Josef Stalin. If Stalin stayed and the Germans killed him somehow, then resistance would collapse pretty quickly. The Soviet only fought on in 1941 because they were more scared of Stalin than Hitler.
6. Looks like Heydrich is going have a lot more work to do. The SS would probably get rid of all current assets, and maybe if they looked closely enough they might find files about the Oster conspiracy. But that's a whole new TL in itself.