I remember waves to be one of the biggest projects in 2017. But it's just that after that hype, it didn't maintain the popularity that it got. It's actually one of the early smart contracts after Ethereum.
Which coin(s) do you think are underrated for 2021? Do you think 2022 will be a big year for altcoins? If not, why? Your input will be greatly appreciated. Thank you. 
I don't know about the underrated coins for this year. It seems that most of them have been given a highlight. And about 2022 as another year of altcoin, we'll know if bitcoin reaches new ATH again.