usually if the price of bitcoin rises high or bullish trend altcoin price rises not big or even tends to sideway but if bitcoin experiences sideway then the price of altcoin will rise high. after the price of bitcoin rises high. wait for the price of bitcoin sideway then the price of altcoin will skyrocket high and that's what is called altcoin seasson.
As most of us await the bullrun, we are expecting great love in most altcoin. With this your explanation and what we are experiencing presently, should we conclude we are gradually moving towards the altcoin season.
Practically, I don't recall any season being an altcoin season. But it there is then it's my first time but I only have heard that after the run in Bitcoin price there might also be coins that will run with Bitcoin because of its attachment to Bitcoin. Altcoins don't have bull run but they run with Bitcoin when Bitcoin experiences the bull run if I'm correct.