You cannot add a draw 2 on top of a draw 4 card. Nothing beats the Draw 4, it automatically takes your turn away. You can put a Draw 4 on top of a Draw 2 but ONLY if you do not have any more of that color card in your hand.
You can also risk putting a Draw 4 on top of a color that you do still hold in your hand, but another player can call your bluff (because by using it you are saying you do not have any of that top color in your hand) and you will either have to take the entire discard pile or draw 4 cards depending on how you want to play.
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.