It's hard to tell if 2021 will be the years of Litecoin, I believe it will grow in time.
Ethereum has also struggled in the past two years IIRC but now it's been moving well, AFAIR, Litecoin were able to compete with Ethereum in the past in terms of price but that's how the market goes, no one stays at its ranking forever and sometimes a coin struggle but what is important is it will survive and will rise again.

Take Ethereum for example, it dropped many times between 2018 and 2019 and this year it only started at $100+ but now it's already trading at $400 and it looks like soon it will breached to $500. So it's really amazing how its moving so I believe it's also possible that Litecoin would grow at the right time as this coin also has a potential.