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.

You simply sell the amount you're happy with. In the first place, selling slowly vs dumping all in one go is almost just a guessing game; unless probably when bitcoin just had a 20% candle then it'd probably be better to dump in one go. In the end though, only time will tell which one is the better decision.

 Many financial pros recommend dollar-cost averaging when buying into a position, but it can be counterproductive when selling, as we'll see in a moment. First, let's review how dollar-cost averaging, or DCA, works. In conventional DCA, shares are purchased at regular intervals and in fixed dollar amounts over a period of time. One of the benefits of DCA is that it causes the investor to buy more shares when prices are low and fewer when they are high. DCA also reduces the volatility experienced by the investor and helps the investor avoid the temptation of trying to time the market by finding the right moment to invest a large sum all at once.

A similar strategy could be adapted for selling. For example you first speculate what the top price could be using 2017 prices lets say you speculated top is going to be $10k then you place a small sell order like 10% at $9k then another bigger one like 40% at $10k itself then smaller sell orders at higher price like 10% at $11k and so on. This way you can sell at the price you predicted to be the top while still took a smaller risk selling at higher prices to maximize the profit.
You also have to accept the consequences of the decision you made such as the peak of the bubble being $20k or a couple of years later price reaching 6 times more than the price you sold at and go as high as $60k.

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. 

Just.. sell it one go? If you want out, you won’t be trying to think of more complex ways to get it all out. You just do it and that’s it. No need to do it slowly since you already called it quits. After all, if you already maximied your profits in that amount of time, it wouldn’t matter much if you miss a few hundred dollars just because you were being ‘impatient’. That few hundred dollars ‘loss’ may even be negligible in 4 yrs with the amount you would have gained by then.

Let me share you my personal experience here.
I have been accumulating bitcoin for the last few years, it was not DCA method but kind of buying the dip and/or buying whenever I had some excess fund. And I have sold all of my bitcoin when the price was around $35k but later on, it was 2x almost from my selling price which I was really upset with. That was a great mistake. And now I'm considering starting DCA as I don’t want to miss the potential future pump.
I would liquidate part of my bitcoin if I were you now. I recommend selling 30/40/50% in a certain range and hold the rest.

That is the function of Bitcoin that you hold, sell or hold it for a long time only in your own control, not interpreted by any party. If you intend to sell it, you can do that in no time. Nothing to suggest other than going back to your wish are you ready to give up all your Bitcoin hold or still want to own some of it? Use and sell it sparingly, who knows in the future you will really need it. And I think it's bound to happen.

Usually I use lump sum strategy when I trading. But this year I use DCA, I only use DCA when I am not sure about lowest or highest level price of bitcoin at a bullish or bearish market trend. I think we don't need complicated strategy in trading. I think you can just sell all your cryptocurrency at one time if you are sure that you can get maximum profit. If you are not really sure then you can use DCA again to sell you cryptocurrency. The most important thing is you only sell at the top of bullish market. I don't think that now is a good time, I think you should wait until the price of bitcoin is higher than now.

Sell all your crypto balance at ATH and wait for the price to crash (for example, more than 60%) then buy Bitcoin at that value and withdraw the rest as net profits.
We can give you a lot of strategies, but the problem is how to calculate taxes, which will make multiple buying and selling a loss because part of it is lost in taxes, so it is better to do it once.

Again, this advice varies depending on your country and its tax system.