It is not difficult if we believe that the price of Bitcoin in the next cycle will be the same as the previous cycles so that in terms of percentage the same thing will happen to achieve the accumulation target.
Regardless of whatever happens in the future, if we have set aside initial capital for the investment we make, there is no fear of anything that happens, for example, in the previous cycle we have reached the target and what needs to be done is to take the initial capital (don't take profit) then we make a new target so that for whatever happens there is no excessive panic.
But what I believe is that the future of Bitcoin is the same as the previous cycle and that happened today, so in the future we will also see the same thing.
Using this your formula, you would only be leaving your profits after the bull run to remain in your portfolio and taking out your capital every fucking cycle? This shows you don't fully understand the attitude of a real investor and you're trying out some smart ass practices on your portfolio. You'll end up with very little quantity of Bitcoin in the end since you're not really accumulating it, but gambling with it.
As a dedicated Bitcoin investor, you don't tamper with your portfolio until the expiration of your holding period, else you risk ending up with fewer coins because you must've sold much BTC too soon and you'll surely regret your actions when the price of Bitcoin has gone really high and you're not having enough coins to get good profits.
The goal is to continue accumulating Bitcoin to have a good quantity of it before the expiration of your holding period, and since you're going for a long term, by then the compounding effect of Bitcoin price increase would have be felt in your holdings and your investment would be very profitable.