This is the most simple and 100% working method. And yes it's boring and need a lot of time.
I don't consider that method boring. Because making an investment decision is not boring, it requires calculation, checking all the risk measures, and trying to figure out how they can be minimized. After doing that, you will definitely be doing some research on when it will be the right time to pull out your investment and take home some profit, which is also one of the most important parts as the reason for investing is to make profit, and when your first investment has actually yielded a profit, one also still needs to study the market, either the stock market or the digital market, in order to know when it will be the right time to enter back and expect a fruitful harvest in the next harvest season. So the process of planning all of this doesn't look boring to me, as one will have to study and make some decisions that will contribute to the level of success they could possibly achieve.
If we are considering bitcoin to be in the mix of investments, it seems to me that framing our dilemma in terms of pulling out and getting back in does not seem to be a good idea.
One of the first things to consider is to figure out how much you need, and then continue to build towards getting how much you need and perhaps more than you need, and then once you have reached what you need or more than you need, then you will have more flexibility in terms of figuring out how much you might pull out in order to offset large price swings, and hopefully once you figure out how much you need, you will be careful in regards to going back below how much you need in the event that you are even willing to take those kinds of gambles at all.
There are likely some other kinds of investments that you are mostly just building (just like in bitcoin) and mostly not selling, even if you might shave some off from time to time, whether referring to properties, equities, commodities, or cash equivalents (like bonds).