All of the metrics you have are good metrics to monitor, but if you want to use content to convert into sales vs. awareness or loyalty, I suggest creating a content funnel within the larger growth funnel. Of course, figuring out what the steps are in that funnel will be different for everyone.
For example, Workato is an intelligent automation and integration platform. There's some education involved here as well - we can do everything from automate tedious tasks to some really novel and incredible stuff (like AI powered workflows, taking actions in apps from Slack etc.) all without code. But because we're a platform with vast capabilities, it's not always obvious or easy to find the thing that will interest each individual. That means, for prospects who don't have a specific, pressing integration need, a conversion from a content page is highly unlikely. We know that it may take months for that lead to be ready to purchase.
We obviously want to attract readers to our blog and use readership as a metric, but our main focus is on qualifying leads. We nurture the lead with our newsletter and then qualify them with other steps, like downloading an ebook or installing our bot Workbot for Slack. So the metrics we want to see are: repeat visitors vs. new visitors, newsletter sign ups, conversions for micro-steps. Once they are qualified by our set of criteria they can move onto sales.
Hope that helps!