As a rule, gems should be searched for not on popular crypto exchanges. If you see some coin there, it means that your time is gone and the coin has already grown without your participation. Gems should not be found on popular crypto exchanges, but on decentralized exchanges, various launchpads or in various communities, which notify about various activities and for which you can get new tokens. That's where the real gems are. Once an altcoin becomes popular and highly liquid, you won't make much money on it.