5) Post at the right time. Let’s say you want to post in the r/Entrepreneur/ subreddit, but there’s already a post in the #1 spot with 200 upvotes, and it was posted 4 hours ago. If you post at that time, you probably won’t overtake that #1 spot, and you’ll get less traffic. However, if you wait a day, check back, and see that the new #1 spot only has 12-15 upvotes, you’ll have a golden opportunity. It will be much easier for you to hit the #1 spot and get hundreds of upvotes.
And your “Zombie Pages” way is a really a PROVEN way. 15-20 days after getting hit badly by Broad Core Algorithm Update, I sorted out the least performing unnecessary articles (around 50% of total posts) from the blog and deleted them. Then, BOOM! Within 4-5 days, my search rankings and traffic got increased steadily day by day to get back where it was previously.
Traffic data is a great way to take the temperature of your website and marketing initiatives. When you are writing and promoting blog content on a regular basis, you can use traffic data to track results and correlate these efforts to actual ROI. Be sure to look at traffic numbers over long-term intervals to see trends and report on improvement over time.  

The majority of web traffic is driven by the major commercial search engines, Google, Bing, and Yahoo!. Although social media and other types of traffic can generate visits to your website, search engines are the primary method of navigation for most Internet users. This is true whether your site provides content, services, products, information, or just about anything else.