a little short recap, increasing your ranking means your building backlinks and it with some hardwork you maybe on the first page of google meaning additional traffic, but traffic doesn't come only on search engines actually 10% of my websites traffic only comes from google and others are split into other areas so to turn your traffic into sales or leads you should have a marketing mind, experiment on other methods and don't focus much on page ranking.

PS: make sure you created a well built content for your website.