It is really hard to predict the perfect down of the market. Each and every price can be considered as the right one to enter the market. If we were able to enter at the perfect down the time to experience the profit gets lowered. If one enters the market at the top, automatically it'll make the user hold for a long to experience the profit. Rather than looking for an entry, I suggest users to develop the minds to have patience with which it is possible to overcome any sort of market downturn.
It is impossible for everyone to buy at the bottom as when everyone start buying the rates go up. So no need of trying to predict the lowest point. It is okay not to buy at the high and when you have opportunity. Bitcoin someday will go up, so just no need to hurry.