You will find more success if you limit an EA’s time spent trading a Grid. A trend will destroy any profits a Grid EA can make so always watch for longer term trends forming.
One method is set a price range for your EA, ie: Current 1 Hour chart GBPUSD, set 1.3990 as a top close of the Grid as this will indicate a possible break from the current ranging and say 1.3930 as the bottom close for the Grid Strategy applying the same logic as above.
Another possible method is limit the EA by the number of trades it performs during each application. ie: Once the Bot has completed say 8,10, 15 trades, close the Bot and search the pairs for more opportunities.
Below is a couple of threads from a few years back that I displayed a few Grid Trading techniques.