You posted in 2021, it's 2023 now, and the price of the MATIC coin hasn't experienced a huge price increase, so I think the reason is because the competition in crypto is getting tougher.
That is true, there are so many altcoins offering the same features to adopters that it becomes a big competition where no one is able to outstand among others at all, so ETH continues ruling the altcoins market. MATIC seems a solid altcoin, and might be a promise for the next bull run, although being realistic I wouldn't expect more than the price range it has already hit on the previous ATH, so there is a 300% profit potential ahead, while with bitcoin there is a 400% profit potential ahead to its previous ATH level. Considering this, I think Bitcoin is still a more reliable alternative, because the risks are lesser, while proportionating superior profit chance.