I feel as if I am repeating myself, and I know that we are not talking about selling in this thread, but sometimes there seems to be some need to make a point, which you keep talking about selling all your bitcoin which and then you talk about holding after that which largely seems to mean that you would sell and then try to buy back later.
You are absolutely correct, it is good to make a point, but I would like to ask investors who sell their coins for no reason what is the essence of selling the coins when they know they still buy letters. Is it not better to leave the coins and to save the stress of selling and buying decisions again? I think sometimes they even run at a loss for making such a decision, that's why it is good to have a separate funds so we can not be selling our hodings when ever we like.
Let's say that a hypothetical person got into BTC in early 2016, and such person had a salary that when from $10k to $30k in the past 7 years, so if such person had not made too many other investments, maybe such person had made some mistakes along the way, but maybe ended up accumulating 2 bitcoin.... so it could be possible that such person never sells all of his/her bitcoin but instead maybe shaves off 10% of his/her then holdings at various points in time.. at $100k, at $150k, at $250k.. .. so even if there might be questions of BTC price direction, the amount of BTC that is sold is less than the profits that had been made in the integers.. and surely you could look at 2 BTC and you could say that from $30k to $100k the profits had gone up $70k per coin, so a total of $140k for that price move, so if there is a decision to sell 50% or less than the profits, you will never run out of bitcoin and you will still be able to skim off pretty decent profits to either be able to buy back if the BTC price goes down or just use such value for consumption purposes.. .
From a $10k salary per month, if the investor invests $2k per month for 3 years, it is a total of $72k. For now, about 2 points something BTC, the investor might decide to sell some specific amount that he can use for important something like starting another investment because that is also a good idea.
When a salary increases to $30k, the investor can decide to increase his investment to a good amount like $5k or above, so he can have multiple folds for the 4 years and investing $5k for 4 years will give you a good amount of BTC at the end.