I think because of the trend of most coins that are going up there is a possibility that prices will up again, this is like a cycle, especially for altcoin and it is also is difficult to choose a altcoin that is going down but has potential to going up.
The volatility of altcoins is fundamentally unpredictable because it will often depend heavily on news and investment needs during that period. Most of them only care about profit when that coin increases and will sell all altcoins to ensure profit. Of course, there will be people who make huge profits and who lose, so you need to be careful when deciding to invest.