B2C Marketplace Growth Tactics - I will not promote

Hi all As the title suggests I’m looking for interesting case studies or insights on marketplace growth tactics. For context, I’ve setup a marketplace product, currently just a web app with native launching ideally next week. Early traction feels solid, approx 400 users from manual outreach in the appropriate local geographic Facebook groups. The 400 users are split across the buyer and seller side of the marketplace. In our case there are 3 user types, two of them being sellers. I’m being intentionally vag