If you just want some quick action points (not as elegant or well explained as the original article), then the following summary (in my own words) might help :
1. Make the conversion process simpler.
Review this from time to time -How can you simplify your conversion further? If you have some dominant keywords bringing in traffic, can you simplify the conversion for each set of traffic understanding their intent?
2. Give something to get the conversion.
Make the user feel rewarded and willing to reciprocate.
3. People hate loosing. Use this concept in your copy.
Example “Offer closing soon”, “Book now before all spots sell out”.
4. A confident voice can influence the majority.
If you have some good (converted believer type) testimonials then present them prominently in your copy.
5. Social influence helps
We have a tendency to believe that if so many others found this useful, if so many others say this is good, then this must be good. Show reviews and ratings prominently (injected in copy or CTA if possible).