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?
Alt season is a myth! It doesn't exist and it is purely a made up term to create marketing gimmick. It doesn't mean anything in real life. What really matters is the bitcoin season and not altcoin season! It has been observed that altcoins do rise in value only when bitcoin starts rising! Yes, there are few altcoins sometime are able to create some marketing buzz, but that can't be counted for the whole lot!
So always look for bitcoin and its pricing dynamics. That's what is only worth your time!