When you decide to buy and sell should entirely depend on the investor's opinion and analysis, if you don't trust that bitcoin is going to exceed the current value of aound $4,000 and continue rising, either on long or short term, it's better not to invest and risk regretting your decision to invest money into bitcoin at this time, Of course, the price can continue rising, but I believe the decision should be entirely based on your opinion, not external factors.