This is a normal phenomenon for the crypto currency market and is a good opportunity to buy at the bottoms. But no one knows when the fall will end and growth will begin. Therefore, it is better to buy at once not for the whole amount, but in parts.
Spending all the money to buy is a bad decision, we can buy it gradually. This is also to anticipate if the falling trend still continues. So we don't spend any buying activity with just one action. We can do this within a certain period of time adjusting the market situation.