Yes, there are many blockchains but if you notice, a lot of them must have started on the Ethereum blockchain, however because of how outstanding the Ethereum blockchain is, they are all finding it hard to beat it till date. Starting with ADA blockchain, sometimes it gets congested and one will ask if it is capable of challenging the Ethereum blockchain, even Solana some days ago had issues with their network thus still proving that Ethereum is more effective and efficient than them.
Asking, about Solana, it has proved itself through the massive growth it experienced so far this year alone, and currently a lot of projects are building on it which will lead to more growth. Also, owing to the fact that DeFi and DEX are still coming back gradually, Solana might be the centre of attention soon because it's evident the blockchain is attracting more good projects. Nevertheless, more blockchains are stepping up such as Fantom, and the competition in the coming months will be a good one, which will be good for Solana as it is already leading in that aspect.