It's a big mistake to sell your Bitcoin with intention of buying them at low later. People who follow such strategy never get good return because there goal is to get few buck profit and that's it. Those who are holding Bitcoin for long term need not to worry about ups and downs of Bitcoin because the price will eventually go up.
Is it really a big mistake to sell portion of your bitcoin and then rebuy back when the price has dip?
The reason why am asking this question is because with the right approach I think this can also be done and even help you get good value of bitcoin when the price dip but there are conditions that would prompt you to actually sell some fraction of your investment.
Let's say your investment has reached the amount of years (5+) you set for it and it's now time to sell with the motion of selling being tied to the fact that the upcoming season is probably going to be the bear market, isn't it going to be a good move to actually sell portion of your portfolio (not all) and then still continue with your steady buying and as you are running your normal DCA you are still active on the bear so that when the dip comes you can buy back with that sold amount from bitcoin portfolio so that your value of bitcoin is bigger and still go on and continue with your investment plans.