In my opinion, the altseason is already here haha, look at Doge which has risen more than 120% in 1 week, among several coins
You have to consider 2 things this time:
1 - there are more and more coins on the market, and the value is even more diluted
2 - this rise is strongly linked to the institutional, and companies won't invest in random altcoins, they came for BTC, so I think it's more difficult for the marketcap to rotate towards altcoins this time