It seems the Bitcoin drop price start over many time,sincerely bitcoin price is very close when it comes back.suddenly there should be no wrong decision.It would be better if we could buy a few bitcoin of the low price.So this is equivalent to a profit in the future.
therefore, while the price of bitcoin is still low, it will be our chance to have it at a low price too, so that it will get a big profit later when the bitcoin prices rise again