The best time to sell altcoin is when btc increases slowly. We will sell it and get it. I trade a lot and I see that!
Market is not accurate situation to sell them because bitcoin price reduced a lot in the market and it is effecting other altcoins. We have to wait some more time when bitcoin price start increasing all other coins price start increasing.
yes the market is affected overall and we have to wait for a good time to come in the market of crypto then in that time all of the coins will rise at a higher price. Right now a number of ICOs will be completed and their coins will be added to the exchanges and the price will get higher than the ICO price but better option will be that if you wait for the market of whole cryptocurrencies.