You'll probably also need other instruments of technical analysis in order to be able to trade successfully. You may have to develop them by yourself.
First, you need to have a method in place, by which you'll determine the market ongoing direction.
Second, you need a method or criterion of selection of those very few markets you're going to trade. That criterion may be the market's structure, market's current condition, stage of trend etc. You specialize in it and have the select best 4-5 markets you watch closely for as long as they meet your criteria.
Next, you develop a method of harnessing and milking that market's condition to your advantage, ie. where and when to enter and the same - to exit. Plus the risk and reward components. The higher the probability of your method's success, the less you care about the RR ratio.