Talking about that, it makes no sense that one would withdraw from their portfolio when they're yet to meet their target, doesn't show discipline, one of the features of a long-term holder is discipline and if one has set their target to accumulate a certain amount for a decade or more then the person should ensure they stick to the plan, aim at reaching their goal by continous accumulation without withdrawal then like you said, he can choose to withdraw from the extra accumulated coin. I also want to add that people shouldn't mistake slowing down for a pause or end of accumulation in their portfolio it's simply means that you can reduce the rate of accumulation so far you've met your target, for instance if you were accumulating aggressively before reaching your target you can decide to go slowly after you've achieved your goal and not stop entirely.
You are very right, first and foremost, an investor should not harbour or have the mindset of withdrawing from their hodling, that shouldn't come to play or will I say come in the picture, just as you've said already personally I believe that every investor has a set plan or aim of investing in Bitcoin, so for your purpose of investment to be reach that's to say such investor has to stay unshaken in his or her decision of going for a long-term,we know that sometimes temptation may come but don't see your portfolio as the alternative to solve the problems, if that's the case what then is emergency fund meant for, as bitcoiners we must learn how to persevere, many investors we see out there that has been able to hodl for a long-term faced some waves but the were able to conquer till this moment not because they are extra ordinarily but because they are very much focused and never allowed anything to bridge them from acumualung continuously.
Just as you said reaching your level of satisfaction shouldn't end your Bitcoin investment journey because Bitcoin investment is a continuous journey but go on and on with small figure reason being that as a hodler one you stop entirely, you might be tempted to withdraw that's why micro strategy will always remain relevant in the accumulation of Bitcoin, when you think they will get tired, they surprise people the more, isn't that great, the journey is a long one, although the decision to keep buying even when you have reach your target as you said is a personal decision but continuing is worth it alsince Bitcoin is still what it is.