This year is noticeable by the appearance of a huge number of different coins. The most popular altcoins in this year were meme coins (Dogecoins and Shiba inu and their clones) and native tokens of Defi-projects. 

Now the altcoin season is still ongoing, so many of them are rising and the most popular now are coins like SAND and MANA because they are connected with Metaverse.