We are a marketplace for great projects looking for great designers (https://www.designinc.com), something that needs to grow on two ends. What has worked really well for us is putting out high quality content marketing. Our YouTube channel has a weekly show that is shot with great sound and video quality. When we write blog posts we try to be very specific and insightful rather than pushing lots of cheaper/easier content every week.
Another great channel for us is SEO. Here we also take the high quality over quantity route by building fewer but more insightful landing pages. We want people to spend more time on our content and get value from it.