Here is an important thing to remember:
Your traffic comes from search engines and the value of the keywords comes the keywords found in your page.
What I am saying is that you should focus your efforts on finding low competition, high traffic keywords. Then try and focus your website content for high paying keywords. Don’t do anything stupid like copy/past or MFA type stuff etc etc.
I’ve made most of my money from game related websites. Most people know that game related websites pay TERRIBLE. However, my websites actually paid good because the game website was related to the game’s economy and trade. I ranked well in the keywords related to the game. Most of the keywords are low competition but get decent traffic. When the visitors came to my website the type of ads that would show up would be related to stocks/economics/finance all of which are high paying keywords. There are literally thousands of low competition high traffic keywords out there that no one SEOs for because the keywords are low paying!
For years, I did the exact opposite. I would find high paying keywords then build a website around those high paying keywords. I would try to rank for those high paying keywords. All of those keywords had high competition so I had little luck getting anywhere.
Wax Paper, Tin Foil, Kitchen Gadget. Go make those blogs and get rich!