These coins are potential and can yield good returns in short time. But it would be better to do a research on your own rather than asking people here.
You would get a better understanding on which coin to invest and why to invest in it.
If you invest in a particular coin in regular intervals then it will yield a bigger profit in the future.
Yes, I'm always researching what's the best and that's the reason why I've gained profit as I mentioned in OP. I'm just checking on some potential coins that I don't know and will do massive research on it.
That's good that you are researching on your own to find out the potential coins.
I would recommend you to check out Polkadot, Monero, Solana as these are some really good cryptocurrencies.
Cardano is already on your list. Bitcoin and Ethereum are the most potential ones and I am assuming you would have already invested in it.