Indeed, it really depends on each investor's strategy and plans. some people will sell all their bitcoin and try to buy it back when the bear market comes, some people will not sell or only sell a little because they have not reached their set goal. personally, I would sell everything rather than keep it because I have my own plans, I think it would be unwise to hold on to some during the bull season when we can buy it back cheaply during the bear season. so selling half or selling all is really up to each person.
I agree that it depends on each person's particular situation, but I personally don't like your plan to sell everything because you will never know for sure when the bull market starts and ends. When will you sell? When the price passes $69,000? $100,000? What if it goes to $250,000? The most logical thing to do if you want to sell is to make partial sales, it's like DCA but selling. And the same with buying back in bear market. Many were waiting to buy at $10,000 when the price dropped to $17,000.