For the moment i just Hodl ! But in the future if the price will still falling down i will buy some coins, right now i am just waiting to see how low can the price will go...
Time to start buying at lower price and on some recovery you can just sell this fresh buying and make some quick profits. While rest of the coins you can continue to hold it as selling in this deep red losses would just hurt you and then you would see market to rise and it will be double loss for you if you sell it now.
Actually I'm a little hesitant to say 'this is the best time to buy' and also at the price of $ 6400- $ 6500 we still say this is a good time to buy while we still have tomorrow that we don't know yet. It would be great to say that 'this is a good time to buy' if on this day there is a signal that bitcoin will increase, even though we cannot fully correct that information.