Why selling everything i dont think that would be very great for the people who having bitcoins because why selling all of them if it dont need to spent all of it. Never sell everything just invest everything.
The idea of selling will only happen when you see a great price and you are guaranteed already to earn a profit, but if you are not on that situation yet you should keep your bitcoins and wait for the right timing before you sell, do not be greedy and follow always according to plan for you not to miss the opportunity.
All that will be depending in how much the price on the time when you buy bitcoin do not to rush to sell everything but some of the time the whales do something to make us panic selling that is their target when the price are going to get down just be careful on that.