Traveling Merchant In the Apocalypse

One day a floating screen suddenly showed up for me. What? Traveling merchant? Trading? Farming? Armor? What do you mean by the fall of humanity? Can’t you stick with one genre? I just wanted to graduate! _____________ Hi, you can find me here or at RR. English isn't my native language, so let me know if there's anything that seems strange when I write it in English, so I can try to adapt. For now, I'm not sure about everything in this story, just there is a system, a female protagonist, an apocalypse and a bit of progression (weak to strong). [It's apocalypse, so it will probably have some sensitive content later, even if not much, so beware.]