There is nothing to be unsure of. It is a fact. Many years of experience cannot make an investor know what the price of bitcoin would be. Although experiences matters a lot when you want to accumulate Bitcoin. It will help you know the strategy to use and when to utilize that strategy to accumulate enough Bitcoin. In my experience DCA is the way. When it goes up we DCA and when it goes down we DCA as well. DCA has helped me neglect the urges to trade short term and sell often. With time it will be the best way to accumulate Bitcoin.