QLD

Hi Pat, I've just analysed the QLD chart for the last 18 months looking at what would have been the result if I had bought each time it closed above the 21 DMA and sold every time it closed under the 21 DMA.  The result would have been gains totalling 114% against a buy and hold strategy of 73%.  The first buy would have been on June 10, 2019. Does this look like a valid strategy for playing QLD longer term?  Can you suggest changes that would make it more profitable or less risky? Thanks, Jim