crypto-currency is decreasing no, there are a lot of reasons such as hacking incident and moving currency but there is one more reason why crypto-currency except for bitcoin & bitcoin cash and bitcoin gold
above three coin consist of 40% of the crypto-currency, the scale of coin is very diffrent from other coin
now a lof of money is moving to bitcoin coin series, when it is finished and people try to sold bitcoin series currency, other coins also will be up again