if you are already tempted to sell some or all of your bitcoin within the past 5-ish months then how are you going to be able to continue your investment into bitcoin for 4 years or more... perhaps you don't really know how to consider bitcoin as an investment rather than a trade, efven though you did use the word investment to suggest that you were actually investing into bitcoin.
In the past few days, weeks and months bitcoin prices have reached some unpredictable prices making multiple time highs, A lot of bitcoin holders have let go of their bitcoin holdings, and in their minds, they consider that as taking profits but in the real sense you are right to have called them trader's because only traders will have such short term investment journey in mind for bitcoin and I must say that majority of them are future or derivatives trader's who gamble on the Bitcoin price for sort term buy.
But no long-term Bitcoin investor will ever let go of the bitcoin even if the price reaches $150k to $200k Bitcoin price.
You are right, short-term investors are basically traders and they try to exploit the price fluctuations of Bitcoin for profit. They constantly worry too much about the price, and they make decisions like selling their holdings when they get scared. And that is why they can never achieve great success.
But those who know the real potential of Bitcoin, they never think of selling, they only focus on holding. There are even some holders who will not think of selling even if the price of Bitcoin exceeds $150k or $200k, they will want to hold on for a more longer period. And they are go on the verge of achieving even greater success in the long run.