People are creating great new modules for the mirror and you are lucky if you can maybe find them.
There is no good structure, imho.

Sometimes you learn about new modules, which you was always looking for, by a comment from someone else. or you see something interesting on a screenshot.
Yourself would never find it in the “showroom” , and in the subcategories… if the developer even has put it there.

So, i do not really know how to solve that, without a huge effort, but maybe someone else was facing that also?

I saw a “beta” version of something like a showroom, but the same, if the dev has not put it manually there, you can not find it.
Also i think a screenshot in a introduction of a new module should be mandatory ;)