The purchase price at $80K, when the price rises to $100k, is partially selling with the example you mentioned. Then the price rises again to $124k.
Means that when he sells at $100K, he has gained profit from the amount sold. To note, the initial motivation to buy Bitcoin for what. If he wants to get a profit for price returns, then what is done is correct by not selling it all of his bitcoin.

There is a good thing, he will feel sorry for sales at a price of $100K when the price of Bitcoin is at $124K. Likewise, when the price of Bitcoin later when it is below $80K.
For me, the long term with the target time is 4 years closest.