If you think, value $14K is high enough and allows for correction for next few days. Maybe you can say this is a good time to sell bitcoin, in the hope we can buy back when value has been weakened. Whenever the time, as long as make our investment grow. Because actually in investing, we own decide.
Exactly, the best thing which can help you in this matter is that you make up your mind like the amount of profit you want to make from your bitcoins right at the time of buying those bitcoins. If you really meed the money then everytime is a great time to sell it but if you do not need that much money it is better to hold it because bitcoins value is still low unlike before that became $20k