to me if you don't sell how would the market make increase for bitcoin to grow back to normal price, it's the buying and selling that makes the market to rise again, so if everyone decided to hold how do you think bullish will come after the bearish.
to me they all depends on each others
just as right hand and left hand, in essence they all assist each others but in a way were by left hand or right will be active (working) don't you know it will surely active the hand because no assistance from the other hand.
likewise to crypto if you have been expecting gain all the time well i most say it can't never works that way because as a business man you have to withstands any challenges in business loose/gain.