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.
Like seriously, so if you bought bitcoin worth of $1000, and you have made a profit of $200, which your total worth of bitcoin becomes $1200, then you should take profit? No, with this pattern you will only end up putti g your fiat funds at risk, and that is not can an investment. Investment should be left to grow and mature. Long term investment is the best investment for bitcoin and if you have finally reached your bitcoin target, you can start maintaining your bitcoin portfolio, and if you must take profit because you see that you have enough bitcoin or more than enough, then that is cool, and it should be good that the profit should diversify the profit into another asset, but not when because you see small increase in your investment worth during your accumulation stage, then you jump into selling all and hold fiat.
If we know that bitcoin is a store of value and Appreciates over time, and because of that we invested, then why are you in a rush to sell and hold fiat that will depreciate instead of still keeping your bitcoin and increasing your bitcoin portfolio, so that you can be benefiting from the compounding interest. It is better to hodli your investment for a long term and if possible see it as a treasure that is worth keeping, so that you will not even sell 50% of it when your have reached your bitcoin target.