I believe the future of cryptocurrency and transactions on the internet is free and fast transactions, not many cryptocurrencies fit in that framework.
 • Vite vite.org
 • Nano https://nano.org
 • IOTA https://www.iota.org

Are a few, I can think of right now that fit the model of free fast transactions.
out of the 3 above I am most hopeful for Vite since it has a very small market cap so it's much easier for that one to make a 100x price increase than the other 2.
also, Vite which means fast in french has a very unique system where they burn vite from trading fees on their exchange vitex.net , and at the moment they are burning more than the block inflation so the total supply on 1 billion vite is deflationary meaning that vite will become more valuable as less of them exist.