The three major things which we need to do when price of BTC is low that just keep your coins with you, don't sell them untill or unless their is any urgent need.Second, if you are not having enough coins in your wallet just purchase new coins at this time and third and the most important thing is don't panic at all because panic selling contribute to dump.
One major thing to always do when prices are down is to just keep buying as much as you can. You have been holding before from the peak after buying the peak, or you have been waiting for the right moment to buy at a very good price, the thing with a down market is to always think of buying and selling should always be the last option when it comes to conditions like this.
For what it is worth, the market will not remain in a downtrend position forever and this is how very smart individuals take advantage of the market in that regard.