When an audience has thousands of creators talking to it, mapping it is easy. When it has almost none, you need a method that does not rely on finding the obvious voices, because there are none.
Property due diligence is that kind of audience. US closing attorneys, title and escrow teams, environmental consultants. They do the work, they do not post about it. The map I built is in the first post. This is the method itself, in seven steps. None of it is specific to real estate. Point it at any narrow professional audience.