If you make a study of succesful traders you’ll notice that although they are all different and use different methods, there are certain underlying principles or qualities that these traders for the most part have in common that in a way, guarantee their success. The method they use is a product of the trader they have become.
On the other hand, if a succesful trader hands over their trading strategy to a random trader that hasnt developed these certain underlying trading skills, that method would be rendered useless.
Imo its not about finding a proven method. That part will come eventually if you work on becoming a better trader in general by developing these certain core attributes that all or most succesful traders possess