I just found this when i tried to search more info about bitcoin earlier this day,
https://www.investopedia.com/terms/s/sell-in-may-and-go-away.aspWhat Is "Sell in May and Go Away"?
"Sell in May and go away" is a well-known financial-world adage. It is based on the historical underperformance of some stocks in the "summery" six-month period commencing in May and ending in October, compared to the "wintery" six-month period from November to April. If an investor follows the this strategy, they would divest their equity holdings in May (or at least, the late spring) and invest again in November (or the mid-autumn).
I know that thread is talking about return of stock, not cryptocurrency, then i will show you this (bitcoin return on every month)

From this pic, we can take a conclusion if after May - Oct, bitcoin price seems more likely in "Red" instead of "Green". What do you think? Is this coincidence?
Vote the poll & give your reason.
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It makes sense from a sentimental analysis point of view. May is like when spring is within full bloom before the begging of summer hits. The only big event that happens in between may and October is the 4th of July event in the states whereas every consumer is preparing for festivities like picnics, barbecues and fireworks. Big shopping happening around then. November is where the big pick up is. Thanksgiving leads directly into Christmas, which equals a lot of money flowing everywhere and every which way you can think. Best time to probably buy in, logically.
Spring is probably where the profits are ripe whereas November is where you catch the bounce. Thus, the cycle continues