The key in this market in my opinion is to know when to hold, and when to sell.
And I think now is the moment we need to hold, Bitcoin could go lower, but not lower than 4000$ .
That is true, but only risk what you're will to lose. I've heard of people investing their entire life savings at the top. I definitely don't think that was a wise and logical decision. We were in total euphoria due to the price climax.