clearly because altcoins market price is influence by BTC market. As we all know that all of these crypto are alternative for bitcoin so if btc drop then so does the altcoins. Just see the BTC market nowadays. It was recorded the bottom of 2018 and still in the.bottom of its market price this year 2019 was 3k + usd. This is very bad for now and we will just hoping for its good in the near future.