The big problem with hidden gems is that, of course, they are hidden meaning they can appear to be out of our radar and then we just learned that something burst out of the seam and become popular. I would say that it would be the same thing that happened with APTOS as I never got into it so I failed to be a part of its testnet bounty campaign. Now, scouring the internet especially the crypto-based sites and forums can be a tedious process and if we have to join all that come our way then we need more than 24 hours a day for that. Sometimes I just realize that things actually boils down to luck...being at the right place at the right time. Good luck on finding the gems you are looking for.