The same trading strategy can’t be in sync with the market conditions everytime. It eventually falls out and you have to work on finding an edge one more time. Before that, you should have a clear answer to if it is just a temporary lapse or have you actually lost your trading edge. Setting some early alerts is good to give you the right answer. Compare the trade return and win rate to the expected return, if there’s a huge difference it’s time to re-evaluate your strategy and find an edge.