Yes, it's likely we're only in the middle of a long bear market, the ATH wasn't actually long ago, and it's still 2 years till next halvening. So you shouldn't be surprised if the price drops further, just don't panic sell and keep hodling. The good time to sell is in bull market, not in bear market, because you never know when bear market reverses, it can happen suddenly and you might have to rebuy at a higher price and lose some coins in the process.
Bitcoin can dip more than we can expect, but it should not be a surprise as to what has happened in the past, like in 2017, bitcoin got to ATH of $20000, it deceased back in 2019 and 2020 below $3900. That was a huge correction. Bitcoin ATH in last year was almost $70000, it has retraced back to $34000. If compared to the last time, there should be more correction, maybe down to $25000.
The worst time to sell is during bear time and the worse time to buy is when the bull market is getting finally over. You are right about that. I believe some people would be panic and sell this time, but the worst decision to make because the price will rise back, though it can be long term.