Italicize the title of the book, get rid of quotations. Give the full name of the author when you first mention him/her in the first sentence. You refer to mankind as "they", should be "it".
Your second sentence does not make sense. I struggle to see how it shows depth. Maybe it displays the ability to demonstrate despair?
3rd sentence also does not make sense. At the very least, you have to recognize that the plot is not simple.
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.