I think content marketing is more important to drive sells but you need unique content for your blog.As unique article provides relevant information & people get easily convinced.So it is more important to put a valuable information about the product or landing page you will easily get more traffic towards your blog or landing page.

You can start working in your On page site. Try to install latest plug ins and do the SEO to your content by providing h1, h2, h3 tags , meta tags, description and keywords. Check also if your website is mobile responsive or not, most website owners divert there websites to Wordpress platform as they see to it the responsiveness of this platform. Engage people to your business, being active to social media will help boost your website authority and visibility.

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Diversify your audience reach through variation in content formats like articles, FB groups(members), fan pages(likes), email list, blog subscribers, youtube channel subs.... slowly you can create avalanche of traffic to any page post or offers within hours.....