Over the years I have noticed that most alt season started as follows:
1. $BTC pumps first.
It is a long wait for the moment that ETH and the rest of altcoins do the rally.
Bitcoin price did spike in the middle of last year but altcoins keep that deep then until we got this new ATH for BTC and waking up the entire market. I saw the rising trend on the top coins in the market and some new coins but this will not help for the rest to behave that way especially for the deadcoins.