It's depend of your target price goal if there is or if you see that you have earned enough that you are satisfied with your estimated earnings then sell it now as we don't know of how much you buy your Bitcoin. Sell high and buying it low again is the life of trading so if you sell your Bitcoin when the price is still at $10,000 before then you will be very fortunate now as you will have the opportunity to buy it again at below $8,000.
Buying for a low price is good for the traders who've learned a lot from previous trades which eventually made them skillful towards handling crucial situation. Actually it's just easy to advice great motivational words, though many people usually advice selling high and buy at low but it's not an easy thing to do. As price went cheaper now falling below $8k, selling isn't a good choice rather buying additional holdings should be made.