Content marketing with link building as a primary objective has its risks. Producing content can be expensive. Designers, copywriters, developers (in some cases), photographers, even videographers might all be involved in producing assets for link building. So if you're going to invest in a content asset or multiple assets, you need to be as sure as your possibly can be that you're going to achieve your objectives.
In this talk from BrightonSEO September 2018, I talk about the steps you can take before going into production that help to secure interest before you invest in creating the content.