The general rule is buy low and sell high but it depends on your expectations and your goals. The price is low relative to where it was a week ago but high relative to 2 weeks ago, then again it's very low compared to just a couple of months ago.

If you believe in bitcoin and are in it for the long term then the decision is much easier because you can be safe in your assumption the price will continue to grow and reach a new ATH later this year. With that in mind it seems like a good time to buy right now.