Hello,
1- How can I view available blockchains by rank?
Most of the high ranks are basing on the value that it has got if you visit websites like coinmarketcap and coingecko. I haven't seen yet the others that have the list by ranks depending on their usefulness.
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https://coinmarketcap.com/chain-ranking/-
https://www.coingecko.com/en/chains2- Which new blockchain do you think has the potential to grow in the future?
It varies if it's with the value of its chain then it should be obvious for now it's ethereum.
But that can change over the period of time, we don't know which one will emerge in the future if there will be newer ones that have the potential.