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Altcoin season started when exchanges started airdropping fraction of trading fees back to holders of their own tokens... Altcoin developers could use the airdrops to push price of their own coins up...

In terms of a really big altseason, I think you are probably right. The old adage of bitcoin first and then the altcoins probably needs to happen to see the massive gains like we saw in January of 2018. However, I think we can see some mini altseasons along the way, and one of those may be on the way in the coming weeks/months.