Polygon Matic and solana are cryptos that have a very good future.
polygon matic working with opensea has a very good advantage and makes an alternative to eth for being able to buy an nft with coins and networks from polygon matic.
many have been developed and I think if the market is good this polygon matic will be able to become a rival for eth. so is solana
lots of new coins are popping up using the network from solana. they also have their own wallet, sollet.io which functions similarly to the metamask wallet but only for the solana network.
I think it will also be a formidable rival for eth