The high accuracy should not be your target (nor the pips). Your target should be monthly %gain, trading style (scalping, swing, etc) and the max dd.
For example, I hate overnight positions, thus I would not subscribe to someone that uses to let position open overnight.
I can provide you with 95%+ accuracy. Take profit for 1-2pips and SL at 300. Would that be profitable?
If I remember well, turtle (might be wrong for this system) had accuracy 40%? but great money management and finally got successful.