YouTube is a great resource for driving free organic traffic to your website. Maybe it's because Google loves YouTube, and considering that it's the second most popular search engine in the world, gaining exposure on YouTube could be huge. Create useful tutorials and videos that add an immense amount of value and be sure to link to your content through the description.
Use this knowledge to understand your conversion rates per ad spend. If you spent $100 to make $800 then you made $8 for every $1 you spent. Conduct more tests, then scale out your efforts using the Pareto Principle, or the 80/20-Rule, which states that 80% of your results are coming from 20% of your efforts. Use meticulous tracking to discover the efforts that are leading to the biggest results. Simple as that.
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Historical refreshes of content is a good thing, especially if some of your content has expired. Note, this does not mean re-doing your content; simply refreshing it to bring it current if it isn't already evergreen content. Look at ways you can update outdated content on your site to drive more traffic through visibility on search engines like Google.