ma 20 high-low

This is a simple 20-period high and low SMA strategy. We buy the stock when it closes above the 20 period SMA of high prices and sell when it closes below it. We sell when the price closes below 20 period SMA of low prices. This strategy works phenomenally well for a few stocks examples are bajaj finance and bajaj finserv. I want to see if it makes a good return in future. It works well for 30 mins and a daily time frame.