If you ever come up with a reliable way of predicting you will become a very wealthy person. There are many people have some very complicated mechanisms to predict where the price is going to be, but I dont these are reliable. I think, for me at least the best approach is to decide long term if bitcoin is going to be used by more or fewer people (I believe more), then based on this you can guess the general direction which the price is going. But it is still only a best guess.