I might be wrong and will gladly ascept any correction but I think their should be a time to invest and a time to begin taking profits, one step needs to be attained first before taking the other.
no one makes an investment without the intention of making profit, as a matter of fact, the reason why we are talking about the best way of investing in bitcoin is because we want to make profit out of our investment. It's not like any profit would be guaranteed if you don't invest in the first place.
Now talking about the best time to take off your investment is totally a personal situation because their are lots of factor that could lead one to stop holding on to his bitcoin which might include unplanned event or an opportunity that the individuals feels could give greater returns to his funds. But in an ideal process when all these factors are out of place, it's best to sell off your accumulation after the price of bitcoin has increased above the amount you bought it, using the DCA method puts you at an advantage while selling off your asset because it's almost 100% certain that you will sell it out in a price bigger than the one you bought it.