The bloggers who do this have quit their full time jobs and do this for a living. No one can give you a list of tips on how to do that.

Those of us who fly for free even 4-5 international premium cabin tips a year have gained knowledge over years, with experience, and with taking the time to read multiple fora here, and many websites that used to be helpful but now have become pitched at the beginner market, with questions like "Can I combine my miles from every airline into one account?" So no one can provide you any tips that will make this magically easy. Read as much as you can, and if you have specific questions, ask them in the appropriate forum.

And I'm not sure if you're an American based on your syntax, but if you are not, it is even harder to achieve these mileage goals.