If you want to earn more profit, you should sell at high price before it falls back but no one really knows the exact time when bitcoin will increase and decrease its price (if somebody knows when is that time, he's hell a lucky guy), so if you missed the chance of selling your BTCs in its peak price, better to Hodl it than sell it in capital price you bought your bitcoin or lower than that value. We want to make profit so we should wait to peak price again to sell and earn more profit.