For me there is a part of regret if you are an early buyer of bitcoin at that state because at the first place is we didnt know that the price of the bitcoin will rise up until that price imagine if the bitcoin still have the same price like that so people will not become interested, its just like the money we are willing to let go because there is no assurance with an investment. With this right now bitcoin has a value already so all you need is proper risk management if you think the price is now going downward and there is no potential at all cut losses is ideal but its seems price of the bitcoin will get too far from that now. Now i started too accumulating bitcoin as I can because after couple of halving's and limited supply and if there is still a demand there is a potential value.

How can an "investor" not expect profit? The reason a person is called an investor is to get profit out of his investment. It's not a charity donation.
Profit is not the only reason I am into Bitcoin. It has made my life easier when I want to make cross-border payments to people I know. It also created an easier means for me to receive payment for my work and other things. I don't have to go through Western Union and other payment services like Payoneer that I used in the past. But it would be a lie if I said the reason I accumulate and hold Bitcoin for the long term is not to make a profit. If Bitcoin didn't give any profit, it was just stable like normal fiat, I would definitely still use it as money because it makes things easier for me, but I won't accumulate and hold it for the long term as I do now.

Different people have their various reasons why they hold Bitcoin. Some might hold it for their kids, as you said, but the most general reason people hold Bitcoin, for the long term at least, is to make a profit.

It's really a thing to regret selling at that time, despite making profit at the time of sale, but compared to the price of bitcoin right now, he must really be filled with regret for selling too early. I really will not blame him for selling at that time,  because I don't know how long he has hold the bitcoin and also how much he bought it, but he would have made more profit now. I have always advocated that the best way to make good profit in bitcoin investment is to accumulate and hold for a long time and hopefully you will definitely make good profit. In his case I believe that he has accumulated it for a long time and he thinks it's the right time for him to sell, but he later regretted based on the price of bitcoin right now.

If someone buys Bitcoin only on the positive side and not on the negative side, then it will not be a long-term Bitcoin plan for them. There are many who believe that Bitcoin is based only on price growth but they panic when the market drops by half. We have already seen that the Bitcoin market has dropped by more than half from the highest ATH, which many panicked and sold Bitcoin at a loss. But those who have enough confidence and have enough knowledge about the market and have a mindset for long-term investment never sell. Rather, the market may fall, but they should not be excited about it and sell it without considering the negative side, but it is most important to hold it patiently. The reason for holding Bitcoin for a long time is to create an asset in the future and make a lot of profit from it, that is why holding Bitcoin is important.