So SCARY Fibonacci extensions, Fib time predicts S&P500 pullback

It would be a horrible time to see a major pullback on the S&P500. Two Fib time extensions and two price extensions are having confluence near the End of 2nd qtr 2021 where the new short margin law goes into effect. How far can we pullback? The forward curve is in backwardation well into 2024! Can 40x Earnings multiples go back to 20x or even a respectable 10x (75% down) maybe?