You have to find out why it stopped working. Was it an aggressive strategy that used to have a 100% fill rate, but now is only getting filled on 30% of the orde

You have to find out why it stopped working. Was it an aggressive strategy that used to have a 100% fill rate, but now is only getting filled on 30% of the orders it sends out? Chances are that you've just become too slow for that trade. The only fills you are getting now are the bad ones. Time to move on or speed up. Let's say the fill % stays the same though. Has volatility in your market dropped off a cliff the past few weeks? Perhaps your strategy is highly dependent on volatility. It'd be good to keep this one running, as it's likely volatility will return at some point. You want to diversify though and have other strategies that perform well in such a low vol regime, so you're not dependent on high vol.