It's really difficult to do it. Some unknown coins could gain attention and become the next trending. Over bunch of assets doing same thing, the chance of you find one is small.
Your best bet would be follow all of the communities and read up about the updates and stuff, follow the projects you deem to think that's promising and invest to upcoming project with money that you can afford to lose.

For sure, they won't tell you the secret. If all people doing the same thing then what's the point?