Some people just sell their Bitcoins during the bullish season and getting back when the market just dumps. They are in huge profit and definitely, they are happy but for those who just sell during a downtrend, that sounds regretable unless if it is necessary or they are badly in need of money.
As I consider Bitcoin for long-term investment, I certainly not to sell them but to hold them. However, we can't influence others to do the same if they don't have the same mindset like us.
Those same people who sell at the top and buy at the low are very few and unfortunately millions of people missed that chance and some of them made lesser profit or maybe no profit at all and in big loss right now.
I am a long term investor as well, I am still in good profit, probably could have made x2 profit so far if I sold my bitcoins at 60k but I didn't because I do not believe in selling bitcoins, I either save them and grow them huge or whenever I have big enough I end up spending them on something of my own, not a physical item or anything, just a project idea that comes to my mind and I spend it on that in order to make some profit, that way I end up being either richer thanks to my project being good and liked, or fail because I end up not profiting at all and losing money on that project, it is not always even about crypto project, sometimes it is about something totally different.