The cryptocurrency market depend largely upon the movement of Bitcoin. People usually believe that if Bitcoin price declines, altcoin price increases. But that not the case. Bitcoin and Altcoin market tend to follow each other if not directly proportional. With the surge in price of Bitcoin because miners started running Segwit2x node, there is a kind of positivity and finally the FUD is over. What I believe is the Strength of Bitcoin assures investors to invest not only in Bitcoin but in altcoin as well.
Movement in Bitcoin is usually a driver to move the entire market. But lately, altcoins have held their own in this volatile market. We have several billion dollar alts now. So if there is positive news on Ether or if Ripple increases its supply, the market tends to move.