With cash flow focused on each of the top altcoins, the whole market will certainly be affected, not just Bitcoin. This is just a correction of Bitcoin Dominance, when it is too strong it also needs to be adjusted for things to balance again.
This cycle is always happening in the Crypto market every time the bullish trend comes, if we understand this rule and choose a good time to buy altcoins top, we will soon become rich. This law is also quite similar to the Dow theory.