Handling this downtrend of altcoins is nearly impossible because this is not like ordinary fall or crash but like end of altcoins, they simple go to zero how can we handle it with little loss 
don't know.
Altcoins are extremely volatile in nature and even if you want to trade their bear trend, you really want to be careful. The altcoin market is the most manipulated of all, and even in some smaller volume trade, they can easily be manipulated into a pump and dump scenario and you really do not want to be day trading such. don't know.I always believe that the best time you can enjoy trading an altcoin is in an uptrend, and with this you can make very good profit from the fluctuations and the higher highs and higher lows, but for a downtrend, you really want to just stay out of it.