only bitcoin matters and that is nearly stable with little ups and downs.
the others which are altcoins are still getting pumped and dumped like always. the things you are seeing red in past 2 days are those which were pumped 3+ days ago so now they are getting dumped and others which you don't see are now getting pumped and are green.
What do you mean only Bitcoin matters? Bitcoin is slowly losing market dominance day by day and it's not even a currency anymore. It's more of a store for value now. Eventually, other currencies will overtake BTC.
BTC is not the only thing that matters. Later on it won't matter at all.