The price of bitcoin really affects the price of every altcoin in the market even Ethereum, bitcoin pumps they dump then recover later, bitcoin dumps -1%, altcoins will dump - 10% that's how it has been, I don't know if it's because alot of exchanges normally pair altcoins with bitcoin, but there's no crypto exchange(aside DEX) without a btc pair, because bitcoin is the most popular cryptocurrency in the world and most people would like to trade their altcoins against a coin they know about.