Before you invest somewhere-the main thing is to conduct a thorough investigation of the project , product , team, white paper. The better the analysis - the more likely that you will find a good coin that will bring you profit, not loss
But you should also not forget about the "opinion of the crowd". If the society, for some reason, altcoins will not be interesting, although your analytical findings will say the opposite, you will not be able to make money on the project due to the lack of liquidity of the coin.