This is a good time to buy altcoins, because we already saw the dead cat bounce and now sentiment is getting better and better. Also many hedge funds are waiting to enter the market.
The market was focusing on the bitcoin, and other just try to follow the price of bitcoin and at the same time the price of altcoin will be decreasing on the bitcoin value. This can't be considered as good time to buy alts.
After the altcoins drop another 20%, it is good time to buy the altcoins.