Identifying what content & channels (SEO/paid/social) are working for your business and bringing the right new clients that provide the right introduction to your business, and what content and offers engage your audience or make them sign up, make contact or buy.
When you get these two right, right content, right channels, then finding more of your people will be an easier road and then you can spend more time refining your craft either in the delivery of your business solutons or your after sales awesomeness. Both are equally important.
Clean Data can tell you which channel brings you your people who devour all that effort you've put into blogs and videos. And it also tells you where they drop off so you can change the way you produce or optimise content.
Making decisions on your landing pages with just heatmaps gives one insight, but knowing where your clicks stop scrolling on pages can tell you where to move offers and Call To Actions so they show at the right time.
A good piece of content takes people from interested to invested, but the better content marketers don't keep looking to publish new content all the time. They look to tweak what they wrote/published so it becomes part of a tight conversational funnel.