Hi, this is something that we have actively been tackling recently.
It's hard to tell what kind of content you're making from your post but as a wholesale product company, we sell items to shops. A lot of our wholesale content centres around shop layouts or displays. It's something that independent shopkeepers have told us they like to see, so we've spent a lot of time on it.
We've found that the best way to encourage readers to become contributors is to start by approaching some of our more outgoing clients and asking them to provide content. We then **heavily **credit them, link to them, thank them and quote them throughout the piece. Before you know it, the shopkeepers that read that content want the same thing for themselves and are much more likely to engage with the contact form.
This content works well for lead generation because it means that we can show shop owners contextual examples of our products looking well.
Just a small example with no quantitative data but I hope it helps in some way.
Ross