After seeing the picture, bitcoin is mostly red around July to Sept. I'd rather divest my funds in June. Currently, bitcoin has recovered its price and the trend is back to normal. I guess it may take another 2-3 months for bitcoin to reverse to bearish.

IMO, this is a good indicator for people to maintain the balance and since the method is pointed out by investopedia, there must be a huge number of investors following this technique. Have you heard about self-esteem prophecy? When there are a large number of people who believe in a same prediction, it is likely to happen.