though i think bull run will be active for this whole year but you are allow to sell the large portion from total assets as you want if you satisfied with your profit. Holding forever isn’t a good decision, sometimes "sell off & wait for dip/shift to another one" is also helpful one but the end of bull run could be happened within the Q1 of next year, according to my analysis. now make your own & go with it
I would say that the bull run stays longer compared to the previous bull run, so people now are more confident of buying without thinking they got FOMO already. As we can also see, the price is still stuck but without a range of a price that could possibly break the current ATH of bitcoin.
The idea to buy cheap is to make a profit when the price rises, so if we believe that the bull run will end, then we should make a timely decision to sell and wait until the bear market takes over, that way accumulation is easy.