Where I mostly look out for, when investing in altcoin is how long have it stayed in the market. Have it experience the bear market, how did it survive it. Not all altcoin have I seen that come out strong when face the bear market to enter the bull market. Many altcoins have diminish in price after the witnessing the bear market, before the bull run comes.
Is a wise thing you do because altcoin is not were somebody will just invest without doing what you did, so actually is from the findings it will either motivate you to invest on it or you will even realize something you would have regretted if you had invested without any research about them. The time they became on a existence is part of important factors because that's the only way you will have all the things assemble about them, but when is not long they came into the market there wouldn't be any concrete evidence as to weather they can survive the market pressure.