Not only Shiba which experience decline, many alt also. At this moment only Bitcoin which up, its not bringing entire market anymore.
What you said is true, but slowly Ethereum is also increasing in price when Bitcoin starts to increase, but it doesn't look so strong when there is a slight correction in Bitcoin that can impact Ethereum to a large extent.
Bitcoin's dominance in the pump this time is very strong. many people are releasing their altcoins to join the bitcoin rally. ethereum and BNB are probably not that big of an impact. but when there is a bitcoin correction later, the altcoins will also have an impact.
hope BTC will not be corrected and strong above. when it is more stable, and its dominance begins to decline, it is an opportunity for altcoins to start a new rally.