I can't cite concrete examples off the top of my head, but some hypothetical ones for economics would be going beyond the fundamentals of Marxism to apply it to how some specific section of the economy operates (i.e. software development, clothes, food) from a Marxist lens, and for sociology it could be dissecting the material and social relations in existing sections of society (i.e. slums, suburbs, metropolitan areas, prisons) or comparatively between societies (those in Brazil vs USA vs Cuba). Those sound good for developing a "deep" understanding.
I think the issue is that the possibilities are very vast, but it quickly becomes both less accessible and harder to produce, as you need solid a understanding of both Marxism and the specific subject (and a lot of effort) for either writing it or understanding it. Considering the prolewiki is inspired on wikipedia, I'd say that the place for "advanced" materials is usually the linked sources and references and that's usually way less accessible to a lay person. I'm not sure if the website would be the place for "in-depth analysis of the dot-com/AI crash caused by venture capitalists" or "origins of metropolitan homelessness" for instance, but that's usually what I think of as advanced. Though I have my biases there, as I'm generally not a fan of staying only on the safe bet of philosophy.
I definitely second that, specially if it avoids the usual Northern obsessions like the USA electoralism, Ukraine war and the "Free World" to focus more on the rest of the world in depth. If I may propose some suggestions, there could be a rule where every post needs to have some brief summary/preface of the article written by the poster to make it easier to moderate out liberal spam and unreliable headlines. Right now c/GenZedong is acting as the de facto world news.