There is no universal method that allows you to accurately determine the bottom and the peak. Even market professionals make mistakes. To feel market trends, you need to study the asset, look at its movements in the past, what provoked its growth and what - the fall. Usually, positive news about technological development, about the upcoming update, about cooperation with large players in traditional financial services provoke an increase in the rate, and reports of hacker attacks, thefts, vulnerabilities in the code - a decrease in the rate.
But the cryptocurrency market is very emotional, and in many ways the movement of the rate depends on the mood of investors. Why at some point investors have a feeling that this update will lead to a jump in the development of this cryptocurrency, and at another moment a similar update does not inspire them - it is difficult to predict. Now, to determine the mood of investors, algorithmic solutions are often used that analyze a huge array of data from social networks, the media, correlate them with trading data and give a certain forecast, but this is not a panacea. Anyway, welcome to the world of cryptocurrencies - there are no guarantees, but it's fun.