I think the problem here is that you're doing EVERYTHING. If you tested out a single vertical (e.g. legal work for startups), and connected it with a market of, say, well credentialed lawyers who're interested in working for themselves, then I would know exactly what your site is for, and how/when I might use it.

If you tell me that I should use you for everything, I'm probably going to use you for nothing. Give the verticals their own websites.