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.
I agree with you. Bitcoin success will come to you depending on how much of your Bitcoin portfolio you are holding and for how long. So Why worry so much about the price of Bitcoin? Can you control the price of Bitcoin for a moment even if you try your whole life? Bitcoin will run on its own, and will increase over time, so what is the point of worrying only about the price of Bitcoin? If the expectation you are investing in, or the expectation you are delaying investing in, never comes true, what will you do? Because of this, you will only miss out on investment opportunities, and if you invest with the thought of short-term profit, you will have to sell your holdings at a loss. So, leave all worries aside and think only about the long term, and keep holding consistently. The chances of success will be higher if you hold on for a long time. Which an experienced Bitcoin investor knows very well.