First of all u need to watch the alt coin company such as activities,airdrops,watch there social networks, how much followers they  have then you will take a simple inner thinking about do you see it will go up in the future
Or it will go down if u decided it will go up then don't forget to invest what you can afford to lose because if your decision was not in his place you you will not lose all your money or even your saving if you had much faith on it

But in the other hand if your decision was on its place
You will be happy for ever

So the bottom line is alt coins is always risky if its new
To the markets