I think you are asking about the price drop next time.I suggest you just wait for hard fork to end.Then bitcoin will come down to 5000$ then you can invest.
Buy low and sell high. It is always been the best to buy low but definitely considering that we cannot predict when will its price will go down, buy atleast when you have an extra money. When the price goes down just this past month, I was able to buy some bitcoin. It was really nerve racking that after just two months it goes up to $1000.