You probably meant 2017 or 2018

.
As soon as Bitcoin overs the current ATH, the situation will change. There will be a season of altcoins, and the same people will suddenly begin to trust altcoins

. You just have to wait.
Hope you are right but now Bitcoin dominance index is 66,8%. It is a very big number.
The 2017 altcoin season arose under certain conditions. The main condition was a large influx of new investors. It is not known whether there will be a new large influx of investors next time. Thus, it is not known whether the new altseason will be so great.
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In 2017 raised the price for all cryptocurrencies. Now the situation is different. Many cryptocurrency projects became scams and their tokens costs nothing.