For instance, suppose you sold all of your bitcoin assets at $100k (a speculative price) during the bull run and waited for the bear market to begin, which would endure for at least two years. There is no way the price of bitcoin won't drop to $15k–$20k between that period.
During the previous bull run, the price of bitcoin was $69k, but during the bear market, it went down to $15k. Wouldn't you regret why you didn't sell at a high price during the previous bull run and buy back at a low price? Although the opportunity is there to buy again at a discount price
Thus, the best line of action is to sell all of your bitcoin at once during the bull run and then buy it back at a discounted price.
well, it is easy to say such but how do you really know if it is bull or bear run? and also, it depends on your financial targets here or your capability to hold long term. we can't say this to all crypto users because they have their own financial needs. maybe, people are associating the bull run to the ATH that we have experienced. but so far, if we refer on this, we are still on the bearish season. so depending on your goals here, and your financial situation, it is on you how you decide on this matter and not anyone else.