What do you do to a trading strategy that already earns you a good percentage in profit. do you still try improving on it to ensure it does not fail? or do you let it be until it starts showing signs of failure?
If a trading strategy is profitable, I don’t think there is anything to do other than keep that strategy and study it more to understand that strategy better. However, as you said, regardless of how knowledgeable and profitable a trading strategy is, there must be a time it will fail.
Your strategy won’t be profitable every time; the market is very volatile, so you can’t be expecting you to be profitable every time. You must lose sometime. Furthermore, as a trader, you are not supposed to be on one strategy all the time since not until your current strategy fails will you start looking for another one, so you need an alternative strategy.