A very good website i use for technical analytic is tradingview , If you know how to work with tools , you also can follow some of the best in technical analytic and guess the price , remember , nothing is guaranteed in here , they are just predictions could be right or wrong.
I agree to you that tradingview is a useful website with a lot of protrader that give signal wich coin will be pump up but in the end no one will know what will happen to that altcoin in has a possibility to pump up or falling down all you need is a good research and analysis because market is a full of suprises and also big whale.
After keeping an eye on Bitcoin for a long time and trying to predict its value but failing on regular basis, I am inclined to agree with you my friend. Crypto currencies are very unpredictable or you can say that one can predict the next pump or dump at most. It is impossible to tell the highest peak during any of the case. Also, no one can tell the duration of these two phases.