I set the chart scale of 1 bar =5 dollars 5:1
March 9, 2009. Convert that date to price (903.09). Add 3960 to it (360 *11) and that equals 4863.09. I created a Gann fan from the March 9 2009 low. I made a gann fan from the March 23 2020 low (11 years) and I made a gann fan from the Feb 9 2018 Low. The 4:1 angle from the March 2009 low and the 1:1 angle from March 2020 low converge at about 4830, just about 30 points shy of my target of 4863. So, Long until April 26, 2022, then a reversal. As a check, I used a fibonacci retracement, from the March 2009 low to my target price of 4863 and the levels appear to line up with other support and resistance that have been observed in the bull run.
Don't rely on this, its a idea, not advice. I have no idea if it is correct, or incorrect. Gann had these out the world wacky ideas, that worked. This idea is meant to learn. GLTA!!