Bitcoin investment doesn't necessarily mean you must sell at any given point and of course it's your investment and money you have the right to decide when to sell and when to buy, but the reality is, when and how did you project yourself? Do you project yourself for long term investment or short term investment, and if is for long term investment then you must learn to have patient over the period of your investment and not too easily gets attracted to the benefits you got from the market, most times the market could dump to nearly -30 percent or above and after some period the market usually bounces back to another price level.
We can take for instance; where we invested 6 to 10 years ago and hold till dates, have you imagined what could be of your profits by now? And of course those who invested them has been on a regret that if they knew they wouldn't had sold off their investments rather could have made a long time projection where they would had to hold for at least 5 to 10 years which their investments could had yield several profits for them.