If you study history, there were winters in the history of Europe that did not end in spring. More precisely, the calendar spring came, but the snow did not melt. Although we know about the existence of climate cycles - winter - spring - summer - autumn.
Past events cannot guarantee us repeatability in the future. It is quite possible that in the current cycle, the ATH was at the level of 73,000 US dollars. And, for example, in the next cycle, the price of bitcoin will be much higher than anyone expected.
And this can be logically explained. The market very often plays against the crowd. When all traders and investors in the market know about the existence of four-year cycles, they may manifest themselves differently than before.