What did the Germans do that caused them to lose the war?

Tler broke his agreement with Russia and invaded overtaxing his resources having a war on more than one front. Not only that he underestimated the resilience of the Russians and was too optimistic about the timeline as they planned to defeat them before winter set in which didn't happen. He also overestimated Italy which did not provide much help to him at all.

Japan dragged their feet too long getting in to help and Stalingrad became his Waterloo. When the Americans, British and Canadians established a Western Front at Normandy, he was caught in a noose, and the end was inevitable.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.