in terms of selling, I think depends on our goals in the beginning. if for the long term why should sell now, under 10k bitcoin prices still low imo. because I'm sure next year when many big events the price of bitcoin will go above 10k. although your prediction is correct and it had dropped to 6500 but now the price of bitcoin is rising again above 7100, so don't panic, if it goes down why not buy again?