For many altcoins, I think 2020 was a bad year. Seeing Bitcoin's dominance in the market which reaches 64%, only a few altcoins have increased in price because investors prefer to invest in Bitcoin. But I think Bitcoin's dominance will decrease next year because new investors will come and altcoins have a chance to go up in price
You really meant what you said on your first paragraph?
How can you say 2020 was bad year for altcoins, perhaps you want their performance to be like that of 2017. Things has change, investors are looking for adoption and usecase than just ordinary shill projects with nothing to show for. Check year till date of top 100 coins and token on market cap, you will find out they have performed extremely okay with atleast a 100% ROI. That's pretty good compared to traditional instruments and assets. Check gold and Bitcoin, you wouldnt complain about altcoins.
On contrary to OP, the year has ended, I don't really see new Altcoin season but may be come 2021,we likely see bull run.