Sure if you have long term investment ideas, then you would likely not be selling any of your bitcoin now, but I doubt that the reason would merely be because you expect profits to be guaranteed in the future, but instead that you had made your investment into bitcoin based on a long term investment thesis and you are not merely thinking about short term profits.
A long term investment idea is depend on what you have in mind and your target, some do not calculate the future well and they began to sell their bitcoin, what triggers some people who is inquisitive to sell their bitcoin right as bitcoin is increasing is because they believe on the physical increment of bitcoin and they don't make use of chart to know what the future will yield, secondly, their is different between someone who is into long-term Investing and short-term investing, someone who into short-term investing doesn't think of the future it only be interested of making an instant profit whereas long-term Investing somebody is concentrating into the future and that is why a long-term investor keeping holding it bitcoin knowing that bitcoin might keep adding in value and as bitcoin is adding its making a profit