alts have been pumping alongside with bitcoin like doubled or even more, that's rare sighting in stock market and people still complain altcoin season not coming, it's either their standard of altcoin season is when alt go up thousands percent or they never see the market regularly. It's silly to be honest.
The reason for something like that is the fact that the price for bitcoin altcoin didn't changed that much whereas bitcoin price versus fiat changed a lot which made the altcoins go up a lot more. So, let's say there is a coin that is 0.1 bitcoin per altcoin, when bitcoin was 10k that means this coin was 1k as well, and when bitcoin becomes 40k that means this coin will be 4000 dollars as well, that is the deal.
There are small changes, it doesn't become exactly the same for long time but it will definitely have some sort of similarity because of this. I am going to go out on a limb and say that we are going to end up with something much better when bitcoin goes back up, if bitcoin reaches 60k, we are going to see eth 2000+ and BNB on 400+ and ada on 2+ dollar, those are prices that could happen when bitcoin price changes to 60k+ dollars.