Personally, I would wait for either a capitulation candle or a reversal of the MACD on the 1 day chart. It's dangerous to try to catch a falling knife. Better to wait for some solid sign of a trend reversal. Sure you will miss the bottom that way, but not by a lot, and atleast you wont get wrecked by further decline. We could easily be on our way to five or six thousand. Remember, 5k, the previous high before the run up to 20k, never got tested. All that said, buying now is definitely a better idea than not buying at all, if those were the options. Well thats my 2 satoshis anyway.
I know I was not too much bright in terms of prediction but I believe to my hunches.