Why did you shut it down?
(One of the things that worries me a lot about taking venture capital is the pressure to grow quickly over growing well / sustainably, so I'm pretty curious about this....)
If they're not seeing the demand it's smarter to cut losses than to continue on without a plan to make the site sustainable.
Did you focus on any cohort or did you just experiment with lots of cohorts hoping one would take off? If you did focus, what if anything did you learn?