It is very difficult to predict the future potential of the coin because a lot of new coins appear every day.
But it is necessary to check everything and carefully study the product that projects offers.
The best way to get free tokens is to participate in its airdrop like this
https://twitter.com/CairoFinance/status/1506234326853238791Only time can show which altcoins have such big potential like Ethereum.
Every day a lot of new projects appear but not all of them are useful and bring an new technology.
Airdpops allow to get tokens for free for supporting the project. Useually airdrops does not require any special knowledge and allow to participate all users.
That is why airdrops are very popular and in demand.