The best tactic when market prices are down, of course, if you have a large capital exploit this situation by buying altcoins that have good potential for the future. besides, keep calm do not panic with the present price drop, if we really believe in all the altcoin we have, you can hold it for a long time and wait for the price to rise again.
Yes i believe that the price dump is just temporary, maybe next month it will pump because many people will buy or add holdings of bitcoin and altcoins because is very cheap, While holding what you have right now.