If you are starting in 1933, and considering what Hitler could do differently to achieve success in the future, the easiest thing to implement immediately that would have the biggest payoff for Hitler would be to arrange to have Churchill have a fatal “accident.” This will make it much more likely that he will be able to achieve some form of co-existence with the British empire when the time for armed conflict comes, or at worst after the fall of France. That’s one big piece of the puzzle for him right there.
Ultimately, though, the major obstacles to Hitler’s plans are the Soviet Union, and then the U.S.
The winning play here is to convince the Japanese that their future (and the resources that they need) lies in Siberia (and of course China), not in the Dutch East Indies. If he can keep the Japanese from striking the U.S., and if he has reached some sort of accomodation with England, the U.S. may never muster the political will to overcome isolationism before Germany is strong enough to absorb and repel any transatlantic invasion attempt.
That leaves the biggest problem, the Soviets.
First, let Mussolini get his ass handed to him by the Greeks in '40 - '41. It will be just as easy to overrun the Balkans after dealing with the Soviets, and the Greeks do not pose a strategic threat to Hitler. By not being provoked into an early invasion of Greece and Yugoslavia, Hitler can enjoy 6 to 8 more weeks of good campaigning weather in Russia during that crucial first year.
Thanks to the extra time and also to the simultaneous invasion of Siberia by his Japanese allies, which will prevent the elite Siberian troops from being transferred westward, and with the beneift of hindsight of the need for better preparation for the Russian winter, Hitler will be able to take Moscow and hold it through the winter of '41 - '42.
If that happens, I think it is not unlikely Stalin would be “purged” by one of his generals.
If Hitler successfully avoided a two-front war and instead forced the Soviets into a two-front war, he just might have been able to reduce the Soviets to a runt state east of the Urals byh 1943 or 1944, less what the Japanese were able to wrest away from them in the east.
Not a slam dunk, as the will of the Russian people to fight and to repel the invader was great, and even a runt Soviet state would still pose a considerable threat.
In any case, this would be the time to address any concerns in the Balkans.
With Europe from the Pyrenees to the Urals under his control, and with no active conflict with the British Empire and the U.S., Hitler would probably have liked his chances for dying of old age in Berchtesgarden instead of eating a bullet in his bunker in Berlin.