I don’t understand what an alt season is other than altcoins growing in price. Why do they grow in price? How do people determine whether an alt season has begun?
When there is a sudden shift, bitcoin being the dominant coin and as per marketcap, still almost 70%. When that gradually reduce to at least 50% and investors moving that 20% to altcoin then definitely we will see the price increasing in proportion to bitcoin.
So currently we're not yet in the altcoin season as obviously bitcoin is still dominating. And almost all altcoin are still way below their previous all time high although Ethereum already break the 4 digits barrier but it need as a lot of money to even break $1400, its all time high.