Try to look for coins that has less than 10M marketcap, a 10-20 Jump would result the coin to have 100-200M which is not overvalued
10M marketcap + Good Development Team + Unique Idea =Rocket and moon
Very few, if any, coins with < 10M marketcap in the the top 30. Also it is not just marketcap, but # of coins. # of coins is just one reason why many think Ripple can't go to the moon. Also need to check how counswere issued. Was it an ICO? Was it open or closed? If closed then highly likely small group of whales hold that coin and you canget caught in their pump and dump.
AGree need to look at the tech and team, but don't ignore the marketing and community support. Coins with no product have shoot to the moon because the community is large and the hype non stop.