How to determine the best time to sell an investment? You sound like a trader rather than an investor, yet a foolish trader. I would like to ask what is your main objective in entering into the investment? Did you enter Bitcoin to get rich quick? If so, you are going to be disappointed. Bitcoin is not a get rich quick scheme. Even if you are a long term investor, why are you in a hurry to sell the investment? I would advise you to keep your hands off the investment before achieving the goal. After achieving the goal, you may be able to take some profit or diversify your investment by selling part of it.