>>137322431. Don't invade Russia in June 1941, I know you're planning it. It will be the coldest winter in 100 years and arrives a month earlier than usual.
2. Destroy the radar network in southern England(ignore Goering he's an idiot) and continue bombing the airfields. The RAF will surrender half the country in less than 3 weeks giving you full air superiority over southern England allowing the Luftwaffe the airpower to eradicate the Home Fleet and secure the channel
3. Change your codes. Enigma is compromised.
4. DO NOT DECLARE WAR ON THE USA. THEY HAVE NO INTEREST IN EUROPE AND THERE IS A STRONG PRO GERMAN FIFTH COLUMN THERE THAT WILL KEEP THEM FROM THE FIGHT. Trust me, Japan are not your friend. They do a deal with the Soviets. Let USA and Japan fight.
5. There are 10 traitors giving every battle plan to a Soviet cell based in Switzerland when you do invade in my timeline, their intelligence leaks lasted from June 1941-July 1944 , these are the names of 7 confirmed traitors:
Major General Hans Oster, chief of staff to Admiral Wilhelm Canaris, the head of Abwehr (German military intelligence)
General Erich Fellgiebel, head of communications at the German High Command (OKW)
Lt Gen Fritz Thiele, deputy head of communications at OKW
Colonel Rudolf von Gersdorff, chief of Intelligence, Army Group Centre
Colonel Fritz Boetzel, chief of Intelligence Evaluation, Army Group South-East (Athens)
Carl Goerdeler, a politician; ex-mayor of Leipzig and head of the conservative opposition
Hans Bernd Gisevius, German vice-consul in Zurich and an Abwehr officer
Likely member:
Admiral Wilhelm Canaris (Chief of the Abwehr)
Abwehr is compromised, purge it completely with full Gestapo and SD interrogations and vetting.
The remaining 2 member are not currently known due to classified document yet to be released. I'm sure
Torture and publicly execute them all. Their actions lead to the deaths,expulsions and mass rapes of tens of millions of Germans.
Good luck!