I'm having trouble with the balancing act. I definitely need to improve the searchability of the site. At the same time if I put everything front and center it'll become pretty apparent that we don't have many listings yet. Will that just turn people away? I'm not sure yet, I don't have the data to say.
Yes, not having a lot of listing will definitely turn people away.
But so will a site with no listings at all, as yours appears.
The first thing you should do is split the site: A big "For sellers" / "For buyers" right at the start, then each group can navigate their own section. Perhaps a third button to talk about what you do, what's special about your site.