Adapt. Yes, you should know that your strategy might not work in all market conditions. So you adapt to the changes that the market develops during various Global or fundamental events. One thing many people fail to do as a trader is that they fail to update their strategy over time and feel more relaxed. The world is evolving and so is the market. You can have a good strategy but still not be profitable because you failed to adapt to different market conditions...
You’re right. A good trading strategy may work well at the present, but when the market inevitable changes start to appear, this good strategy will suddenly turn into a failure until you start losing some of your trades which also put your funds at risk to lose.
With this reason, if updating isn’t the best option, then you have no choice but to start creating a new one. Strategies are born to be good, and are made to bring us profits, but once they lose their value, they stop giving us also the benefits that we always want to achieve.