The idea of market cycles is widely accepted in finance. The most basic principle is that what goes up must come down. The underlying rationale is that investors will accumulate when prices are low, causing prices to rise. As the price reaches a peak, sell pressure will take over as holders seek to cash out, thereby pushing the price back down.
If you bought Bitcoin (BTC) in 2017 or earlier, this will sound eerily familiar. It essentially describes what happened during the last bull run when BTC hit a high of $20,000. Therefore, most crypto holders are watching the current market conditions with bated breath.