That's what bitcoin really is,  not only on bitcoin but in all of Crypto currency out there.  Some other says, the price of bitcoin has seasons too.  Let's say in this month, bitcoin is down,  which is I like the most. This is a time to buy bitcoins because its price is cheap. And after the end of this season,  the price will rise again.  Passive rising point is $12,000 and above.
Everything in the crupto is has advantages,  and  disadvantages.