If I understand it correctly, you just have to sell it then if you want out and take all of those profits.
There's no need for any complex method that you need if you're already done DCAing and you're ready to take the profits you've made after all those years.
Another thing is that just be the typical buyer when the dip comes out and sell at top, then repeat that cycle.
I quite agree with you. I believe that DCA is usually for buying in gradually over a time frame but I too don't see a need to DCA again once you are trying to take the profits because you have built the portfolio over time and are in profits and all that is needed is selling all once yu fell satisfied and do DCA again after the market dips and no need to complicate the exit process.