What did you mean by more benefits? If you mean to increase earning per click - Change your keyword to higher paying ones. If you mean to increase CTR - Adjust website layout to be more appeal for CTR If you mean to increase overall earning - Do above ones I said.
//select proper keywords //decide how much you are ready to spend (cpc) //select correct landing pages //make sure pages have what the keyword is about //check you have good quality score for the keywords & try to improve if not