Now a lot of new coins appear, but a lot of depends from development of the project and what have already been done.
It is very important to carefully check the development of the project like this https://twitter.com/edainsw/status/1456607218854416387
Now many institutional investors buy Bitcoin and use it for investment purposes. That is why the demand in Bitcoin grow and a lot of new tools for investors and traders with Bitcoin appear.
I agree that most popular cryptocurrency is Bitcoin. Nothing has changed from 2009. Bitcoin is the most popular cryptocurrency since 2009.
But Ethereum and BNB in 2021 raised more then Bitcoin.
So one question is what is the most popular cryptocurrency and another question is what is the most profitable cryptocurrency.