Bitcoin price changes all the time, about a year ago Bitcoin price was a small price from where buying a dip in Bitcoin would have resulted in 4 to 5 times more profit than today. Note that only long term is the most valuable, the more dips you buy and hold for longer the more you can reap the benefits. Of course, it is very likely that Bitcoin will hit $100,000 in 2024.
The people who sold during that time never made sense to me even back then. I mean it was obvious that the price was low and it would go up, and yet they were still selling. Volatility is a reality in the crypto world, so yeah it could go down and the price going down means that a lot of people sold, if they didn't sell then the price wouldn't have gone down, but since it went lower then it means that people sold because that's how the price goes low.
But considering it went under 20k, at some point people could have stopped, I mean still selling when it is not even 20k means that people had no idea it would go up this much. Same logic applies to going up, some people must have bought under 20k to make it go up, so they were the real smart ones.