What do you mean there is no more altcoin season? Altcoin season was never a way between Bitcoin leadership vs altcoin, no altcoin is dragging anything with Bitcoin, altcoin season mean that altcoin pumping after Bitcoin is done pumping and the dominance starts decreasing.
It's mean you're not even understand about altcoins season is, I will quote the definition about altcoin season.
The term 'altcoin season' refers to a market cycle when altcoins outperform Bitcoin. Factors that can contribute to altcoin season may include an overall bullish sentiment in the cryptocurrency market; the launch of, or major updates to, altcoins; and a decrease in Bitcoin dominance.
In short altcoins season is to outperform Bitcoin and altcoins season occur because of altcoins, not because influenced from Bitcoin season. Altcoins will not pump after Bitcoin is done pumping because when Bitcoin is done pumping, the majority of altcoins price will decrease too.