In 2017, an investor who bought Bitcoin at $5,000 in September and sold at $13,800 in December felt brilliant—until they watched it climb to $69,000 by late 2021. Meanwhile, someone who bought at $3,600 in March 2020 and simply held through every crash and euphoria cycle turned $10,000 into $690,000. Timing one entry perfectly matters far less than staying in the market through full cycles.