Oh man, people are so possessive about the bitcoin market one can not even imagine how many times such kind of thread had been made! A lot more time! This always happens when BTC reaches to some of the greatest ATH's and then it goes down to the valley. That's natural tendency for everyone who invest their money into the market. That's what we call "FOMO" investments.
It's always without fail advisable to everyone, they must make multiple entry points into the trading portfolio. What I mean is, you must keep buying the BTC whenever it keeps falling down from its most ATH. This can create a proper base and an average Break Even Point getting adjusted to safe zone each time you do so.