Yeah a few years ago, I also assumed Bitcoin peaked, decided to sell it all and buy it back cheaper, I think it was when Bitcoin hit $2000 in 2017 or so. And guess what, it never returned to $2000, I think the lowest was $3500 during Covid or during that Nov 2018 crash.
The WHO announcement on the Covid-19 pandemic triggered that deep crash of Bitcoin but you know, after that crash, Bitcoin recovered in a V-shape in surprise of everyone and that crash is a last washout before Bitcoin officially starts its bull run in 2020.
You will never time the market correctly, you will sell way too early and miss a huge bull market like I did back in 2017. Its the same with stocks. Look at TSLA or NVDA, many assumed it would pullback and they rarely did. And those that sold missed out on huge huge gains.
Timing the market is hard and impossible but it's not reason to feel regret after selling early by inaccurate prediction on the market peak. If you or anyone feel deeply regret about their take profit actions, they will not live with happiness while profit is good to enjoy your life and you should enjoy it. Lesson and reminder are clearly and repeated many times "Don't time the market".