Selling your Bitcoin simply because the price hits $150k is a trading mentality and not the kind of mind set an investor should have, if you are accumulating and holding Bitcoin as your retirement plan or if you have decided to accumulate and hold Bitcoin for 10 years or 20 years and just because Bitcoin hits $150k you decide to sell in other to take profit believe you me you will regret your actions in the future because you have scattered your big plan you have with Bitcoin because of the present profit you saw and you forgot the future profit now as time goes on and Bitcoin keeps growing bigger and better you will regret, as an investor let us always remember there are people who where consistent in accounting Bitcoin ever since Bitcoin was $1k and when Bitcoin grew to $10k some set of people sold and some are still holding till date, those who sold at $10k will wish they where still holding till date, is better you fulfill that big plans you have with Bitcoin to avoid regret and bitterness in the future.
There is nothing wrong for an investor who has hold bitcoin for 10-20 years when he decides to sell little part of his bitcoin holding as long as he is not selling all because he will definitely make some profit from it if he was able to accumulate enough Bitcoin through those years I don't think he will regret selling at that point, there are folks who has accumulated enough Bitcoin and has gotten to their accumulation stage may decide to sell and that doesn't make them to be a trader because they have been buying Bitcoin and hodling for long 10-20 is enough for one to sell if he/she decide as long as they are not selling all bitcoin.
That's actually true. There is a point when an investor may have acculated Bitcoin to an extent where he decides to shave off like %10 of his profit to diversify into other assets or use to settle for personal or private matters . So at this point in time it would not be considered as trading or gambling because such investor who have bought and held Bitcoin for 10-20years is Worthy to reap his harvest. But any investor who is bearly new inti Bitcoin investment within his first 3 to 4 years who tries thesame thing can be considered as a Gambler.