Investing with low price conditions can only be obtained when a dump occurs, but no one knows when it will occur, we can only look at market conditions and predict whether a dump will occur in the near future or not, this makes it difficult to plan long-term investments.
The crypto market condition can change drastically in short time, it's similar like to other investment and it's also sometimes hard to predict whether the market is will go up or instead go down. But technical analysis is said to help read the market condition and what will happen next based on the price and market condition. However, a market dump can happen anytime and technical analysis is not always accurate, that's why it's difficult to plan long term investment but it's still possible just like other investment.