Building a good trading strategy is not at all one time task but it is a long process which requires experience, skill and sufficient knowledge of forex fundamentals. Back testing is a very good technique to test your own strategy before playing with it. However, for that one need to invest time practicing, understanding various technical indicators and then building your own strategy as per your area of interest & trading style. Switching from one strategy to other is not a good idea rather stay calm, patient & invest time in successfully building your strategy. Learning from own mistakes can also help in building a great strategy.