Invitation letters " mean nothing you were denied and if you are in France you are illegal, so appealing illegal status, no sooner or later you will be deported and banned. Leave and go home save yourself a lot of issues.
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.