The fact is that being a no coiner all of a sudden after so many years of accumulation doesn't sounds or look good in my own opinion because selling everything off to me feels like you are no longer interested in Bitcoin or making money through it, but if you are truly a big fan of Bitcoin selling everything off after the end of your accumulation and holding journey is not the right thing to do because you automatic becomes a no coiner, and starting afresh will be very discouraging for you to even consider it again because to accumulate a very huge stash of Bitcoin will actually not take a day or a very short period of time to achieve easily, so taking profit gradually is the best approach if you have gotten to such level of accumulation in the future.
Thinking about taking profit or selling your Bitcoin in the earliest stages of your accumulation is not ideal. Investing is for a long time so thinking about profit now when you still have a long time ahead is not ideal. One thing about selling off your Bitcoin is that you will still want to accumulate at some point again and that will mean you will have to buy at a more expensive price and will make accumulation more difficult.
You should be thinking of how to improve and achieve your investment goals and not taking profit half way. If you can be patient enough to wait for a longer period it will help you benefit even more as Bitcoin value is predicted to reach greater heights.