Bitcoin in my opinion does the same in the crypto space. Whatever the performance of BTC in the market also altcoins are affected.
Bitcoin leads the cryptocurrency market. Nothing is better to see it than looking at the Dominance chart (on Coinmarketcap):
https://coinmarketcap.com/charts/Bitcoin and altcoins move oppositely. If the market is in a Bitcoin season, it's not a season for altcoins. Altcoins only have their altcoin season if investors are boring with Bitcoin and need to find something else to pour their capital in. Altcoin season must come after Bitcoin season.
https://www.blockchaincenter.net/altcoin-season-index/