I have lot of altcoins but all coin price too low but why anyone know? When price come back Or All crypto are die in this year? 
The price are too low because there are a few who invest in the crypto. The prices will depend on the people who are investing on it. You have to promte the crypto very hard to add up to the investors. If there are many who will invest on it then the price will be high. The price is too dumb because there is no one investing but if there are many who will invest then the coins are indemand and the price will pump.