Is there a particularly reason why all Coins are dropping simultaneously this week? If you
look at the charts you will see a pattern
Because the market is being hit by panic sellers, so altcoin prices fall, do not panic and be patient the market will recover and altcoin prices will increase again.
Now market is on recovery mode and if seen in last couple of days some of the coins have moved by by 10 - 20% easily. As those coins value are very low so even a small movement leads to big change in percentage terms. So if you require some profits now you can invest in various coins and in few months can double your investment hopefully.