Since all cryptocurrencies are linked to Bitcoin, most of the other cryptocurrencies fall following Bitcoin as the price of Bitcoin declines, which of course is a big drop. As for why it's a good time to invest in cryptocurrencies, you can get more coins at a lower cost because all currencies are falling.
yeah because many people likes bitcoin than other crypto thats why someof them are shuttig down or getting decreased because some vcoins are not successful in the market economy