Yes its true we need to be calm and don't panic because we have nothing to do if the market falls, i suggest if there is money to invest then just continue to buy more coins while the price is low and hold it and when the time that the price increase and you think you can have profit then sell it.
Well that is the only option you have to stay safe when the market fall because you cannot trade your coins for money due to the fall in the prices and have to hold it till we get the values high again. We have had a down market in the last months and that was the actual time of earning in the sense that those who sold the coins for low profit lost the opportunity to reap handsome money in future when we would have a boom. So staying calm is the only way you can deal the crypto market fall.