I notice that when there the price is going up so many people are joining the train and they also buy because the price is going up and they are going to make a profit, why people are not buying when it is down when the price will eventually go up and they can make a lot of profit.
People sometimes act based on emotions than anything else. When prices go up, people feel that they'll be missing on the "crypto train". Once crypto goes all the way down the drain, you see most of them whining and criticizing it across mainstream social media platforms. This is the common misconception surrounding newcomers in the crypto/Blockchain space. Veteran crypto users will not care about Bitcoin's price whatsoever. Of course, higher prices means more money (profit) if you've invested earlier. But what truly matters here is crypto's usability, than speculating what its price will be in terms of Fiat. Bitcoin and other cryptocurrencies will see constant fluctuations in price, because of the highly illiquid and unstable market. This means that sometimes prices will go up, while sometimes prices will go down the drain. Those looking to get into crypto at lower prices, will become disappointed when prices rise to new ATHs on the market. The same thing happens vice versa with those looking to make a "quick buck" out of crypto.
No matter what crypto's prices may be, at least people can enjoy freedom over their own money. Crypto's decentralized and censorship-resistant design makes it an extremely valuable and indispensable tool. Bitcoin, being the most successful cryptocurrency to date, has been setting new records every time with new ATHs in price. Sometimes it takes a long time before prices become a lot higher than they were initially, due to negative events in the mainstream world. But if you're patient and persistent enough, you'll be able to achieve great results with your investment. In this wild and crazy world of crypto, it's impossible to achieve complete satisfaction. Either people will criticize low prices or become extremely hyped about high prices on the market. It's up to you to decide what to do with your investment in case prices go up or down in an instant. Just my opinion