This what I do: stop doin' art for a week but during that time look outside or anything and everything and just think, think for inspiration and after a week think about any ideas you may have come up with and draw. Or you could study up on some tips to help you grow and try them out when feel a need to draw. Or you could always just start doing random doodles, they don't even have to make sense.
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.