I don't think one trading strategy is enough to be successful in trading.Trading is something that requires experience,and that experience cannot just come from one time trading,or cannot just come from one mistake you made,the experience must come from series of mistakes  you've made,which will inturn make you a better trader.
Getting a particular strategy that works for you is very necessary,but getting varieties of strategy that works is also very important because if you depend on only one strategy to work,it might fail you,so getting strategise to work for you is more ideal than getting just one.