Seeing the current price of bitcoin, make me to feel regret for not investing in bitcoin when the price was $40k last two years, some of my friends that took the risk to invest small amount of funds in bitcoin when the price increased to $50k despite people were expecting bull season in that period, they bought bitcoin and hold until the price touched higher before they released for sale, and they were lucky to make a reasonable income when the price touched $100k, but they were deeply regret for not using huge amount of funds to invest in bitcoin, i no there are some people in this community that had such experience for not investing in bitcoin earlier. I don't think, I will miss the next bear season because I no there will be bear season after this bull season.
Those your friends are lucky the price of Bitcoin appreciated after they bought it because reverse would have been the case because Bitcoin is a volatile asset, we can not easily predict what will be the next movement direction. Moreover, it appears those your friends are traders or gamblers because buying and selling within a short period of time is recognize as trading perhaps they should have hold and keep on investing to grow there portfolio so that in 4-5 years time they will have something great in return. Anyone who do not want to regret while investing in Bitcoin should invest for long term because profit in a short term is not certain.