Anyone that sells his bitcoin holdings early when it's not of his own time must have gotten it wrong from somewhere which made him unable to continue with his bitcoin investment. It's either, he used more for his important needs to buy bitcoin thinking that he will make profits before they need of the money arises, or he did not build up an emergency funds when he started his bitcoin investment.

There is no personal reason that you should anyone sell his bitcoin holdings is he had a proper plan and long-term mindset before starting his bitcoin investment. This is because he will use the amount of money from his discretionary income that can make him flexible with other cash related issues and hodli his bitcoin investment till he reaches his bitcoin target.

This is why one need to figure out how much from his discretionary income that he can use to continue buying bitcoin every week for 4-10 years and above with any stress and also build up his emergency funds or at least three months of his income and reserve funds.  It's good to have the insight of what bitcoin price is capable of reaching in future.