For those who are still accumulating bitcoin, if they sell some of their bitcoin in order to buy back cheaper, they run the risk of not being able to buy back cheaper, so they just end up spinning their wheels or maybe just getting stuck in a waiting pattern rather than ongoingly buying, so the lose their focus and ultimately have high chances of ending up with less bitcoin than what they could have had if they had stayed focused.
In addition to what sir JJG Said earlier, any investor who have not gotten to the stage of overaccumulation should not think of selling his bitcoin not even 3% of his holdings, because if you choose to go with the formula of selling some of your bitcoin maybe when the price of bitcoin doubles this is going to make our accumulating process very slow because at this point you will be thinking of buying and at same time selling when the price doubled, When we are to concentrate only in accumulating bitcoin so as to enable us reach the status of overaccumulation earlier.
and Of course those investors who always choose to sell some of their bitcoin in other to buy back cheaper always lose thier focus along the line, that's because the market is no longer going as they expected, this is why anyone who have not accumulated more than enough bitcoin shouldn't involve himself into buying and selling. We should only stick to ongoingly buying of bitcoin, when we finally reach the status of overaccumulation then we can think of selling our bitcoin.