I won't even think about looking for such an altcoin before a new bitcoin bull run. I will wait first for bitcoin to recover from this bear market. No one knows how long that will take, but I won't risk anything before the bears are defeated. And only then will I look for a promising altcoin to invest in for a 20x profit.
This seems like the safest choice, you can find an ico pumping from time to time but such coin is the exception and not the rule, so it is better to wait for better market conditions in which icos will surge in price in greater quantities so your chances of selecting an ico that skyrockets go up, but it does not seem like many have the patience needed to wait for the time necessary for that to happen.