Thinking about how trading strategies need to always be changed and how one strategy may not work for a long time, what do you do with the strategy that you are about to change. Is it okay to just forget about it completely once a new strategy starts working for us? or do we keep it in remembrance for the future. If you have experienced this before; has any old trading strategy that you decided to apply work for you? Is it possible that old strategies may work in the future again?