The win/loss ratio can not be controlled. Once you enter the trade, the market is in control. You may never get a chance to win on any particular trade.
Risk is real and is in your control. Reward is real but not in your control. Many misguided traders believe because they have charted the trade that the risk/reward is acceptable. You need an exit strategy that allows for big, as well as, small winners to accumulate and that keeps losses at a predetermined risk.