I'd start with looking at a sub-segment that you can reach within the larger roommate seeking group of people you plan to target. Say people moving for work fo

I'd start with looking at a sub-segment that you can reach within the larger roommate seeking group of people you plan to target. Say people moving for work for example. I'd first pick an area that is fertile with people moving for work and seeking roommates. I'd then pitch this platform to as many work places that I possibly can. Give out stickers/pamphlets/freebies and ask them to be handed to new/potential employees or at least get them to recommended you to to such folks. Next, I'd reach out to popular communities that are roommate friendly and do the same to try to get them to recommend your platform to folks seeking roommates. Next, keep track of every lead, every post on CL/Reddit/Fb in that area of focus to gain some sort of edge or insight into your customers needs. That should provide enough data to plan next steps.