In my opinion, before investing in any altcoin I consider the activities of the team, the use cases of such projects and find out if they are following their road maps. When all these are in place I go ahead to invest. For instance I invested in #Bluzelle recently after following their activities, I noticed their mainnet was launched and staking began when they promised to and the price of #Blz is growing organically not pump and dump. These are some good signs of a good project.
Well before you come up investing in one altcoin you must first read or even check its white paper. To be honest in white paper checking its grammatical error may determined the dignity of the said crypto. You also be able to determine by checking the activities of team, did they show any progress or what else. For me, let the coin prove itself first before you take risk of investing it.