You can make more money if the market drops because if the altcoins and bitcoin are decreasing you will get a coin with a low price.
But possible also to lose your money once the coin that you bought during dumping are decrease more.
Yup we can but it's very difficult to make a profit when the market is in red. You must have good analysing skills to pick good altcoins to trade then only you can make a profit or else you will lose your money and if you want to recover your lost you may have to wait for long time.
It is not too hard because if the price I not very high we can buy more bitcoin to save it for long time then after that we can sell it later at higher price, right now it is time t hold so hold your coin, so if you want to get profit with fallen market then hold your coin and sell it later on huge price, selling high and buying lower is one of the best decision.