You need organic traffic on your site to earn better revenue. You can get organic traffic only when you are targeting high traffic keywords. I traffic keywords means the keywords a lot of people are using on google search or other search engines. Therefore, first you need to find out which keywords can bring a lot of traffic and then you can create content around those topics. But remember, using top keywords alone won't get you organic traffic, you also need to build backlinks. You need backlinks form reputed sites, the sites that have higher page rank and are related to your niche.