I believe that even Sorcerer's may not know when bitcoin will rise and when it will fall and thread topic should not make you think we can buy and sell in shorter period, what you needed is buy and buy and buy more bitcoin consistently with the dollar cost averaging method and hodl for a couple of 4-10 before even having the thought of selling and when selling it should not be all but small portion and still keep buying.
Why say "may" you have to be certain! No one, not even the greatest wizard, tricksters or prophet can predict the price of Bitcoin to be certain. If it was possible no one will lose in their Bitcoin investment. Let us leave spirituality and focus on the physical world. The only thing that will ascertain the height of our return of investment is how much we have invested into Bitcoin. How much we have invested will determine how much will be our profit in the future.