Well... There are several ways to predict changes in the price of cryptocurrencies and other financial instruments. You need to know how to determine the trend reversal, why the emotions of investors play an important role in the digital money market, and what you need to monitor in order to learn how to predict the movements of bitcoin and altcoin quotes.
First, you never need to go against the trend. When a trend reverses, it slows down slowly, and this is most often the correct pivot point. And you need to carefully monitor the number of wallets, the number of transactions, and the cost of mining — this data helps to understand the ratio of supply and demand (applicability) of bitcoin.

It is also important to monitor the support or resistance levels, but it is more correct to call them "zones" because these are not levels like lines, but zones around some prices that the asset has tried to overcome several times.

But anyway, I think, it's important to trust the experience. I think, some persons just have some special guts about trending and pricing. If you need any tips, I would like to recommend contacting this person (Roust-Semy). He can give some valuable advice.