I sell my bitcoins when i alreade have the desired profit ! Most of the time I sell it when the downtrends has already started in the market ! when the market is cheap I'll buy mote bitcoins and sell it again some time in the future when I already hit the desired profit and they cycle just continue
One of the reason why they sell their bitcoin is to gain income and we all know that if you sell your bitcoin you could really get high income. However, I suggest you must hold your bitcoin than to sell it because as of now the price of bitcoin become expensive so that there is a chance that the price of bitcoin will become more expensive and may result to a high income.