Interesting project. I can imagine several of the functions being useful--I looked at monster generation and villain generation. But, I didn't find it that intuitive to use. Compare to something like
donjon. The key differences are that with donjon: (1) the names of the generators are intuitive and (2) the output is easy to use in browser.
In the website, I have to click through the categories, which are unclear (what is the difference between "The Combat Forge" and "The VTT Factory"? Compare donjon's more inutitive "Fantasy Calendar Generator" or "Treasure Map Generator"). Then, the outputs in json might be great for a VTT, but it is hard as a user to tell what I'm getting. It would also be nice to be able to edit the output. So the workflow is initial generation --> user views and verifies --> user edits as desired --> json export for VTT.
There are a lot of tools present so if I were you I'd focus on making the current ones more intuitive and easy to use.