The best what you can check is activity on social sites, admins activity on Telegram group, number of proposals on Github and then compare it with the market capitalization. I am sure, that there are tens of hidden gems in the market. 
Many cryptocurrency projects are now active with their social medias because they have understand that, potential investors always tend to check their social medias activities before they invest into their choosen projects. Doing more research into the projects through checking project team profile can also be an added advantage