It may not be as easy said than done as per buying the dip and sold faster,  greed has made a lot of people to be  scammed why attempting to make quick money, what am trying to say is that most it can be very difficult to determine the level at which you may want to fast sell because you would want to make a bigger profits and thereby get disappointed when the market will drop down again and some will never go up again , that is why involving in other coins others Bitcoin is more risky, for Bitcoin matter howuch it goes down it must surely go again.