You're not going to like this, but with the kind of paint you have you're unlikely to be able to remove the scuff marks without leaving behind a dull spot like you've experienced. In some cases this is fine because the dull spot won't be noticeable except on close inspection. But if it's somewhere visible, you're going to need to repaint.
If it were latex paint, you could just touch up that spot and it would generally blend well enough that you couldn't notice the difference. But with flat paint, it's harder. If you've got paint that matches, you can try to dab at the scuff marks with a soft rag.
If you do it very lightly, it might cover up the scuff mark and still match the surrounding area so that you won't be able to see it. Try it at a less noticeable spot first. Let it dry.
If you can clearly see the spot where you've retouched it, then you'll probably have no choice but to repaint the entire wall. I know that's not what you wanted to hear, but I've had to do it myself. It's a ... more.
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.