Some technical analysts say the "sell" point is when stocks drop below their trading "channel" (the yellow).
More nonsense to me.
If you had gotten out of your stock positions at the end of February when stocks broke through the "yellow channel" - which in technical terms was signaling a further drop - then you would have missed the increases from March through July. Please note that the ending values today are still higher than they were one year ago. Overall, the stock markets trend for long-term investors is upward.