If you have reached your bitcoin target does not mean that it's selling time, rather you have just transit to your maintenance stage. You can only think of selling part of your bitcoin when you have accumulated more than enough Bitcoin.
After achieving your goal, an investor can certainly sell a portion to enjoy the gains, or plan to reinvest elsewhere, which I think should be done. Because it would not be wise to put all your eggs in one basket. However, that doesn't mean that after reaching your goal, you should sell all your Bitcoin—no Bitcoin holder would want that, especially not me. This is because you would never want to sell a company that you’ve built with your hard-earned money to someone else. Investment is like owning a company or a business. Once established, it will continue to provide you with profits for a lifetime. You could even pass it on to your heirs if they are capable. Just like you would never be willing to sell a company you built with effort, holding onto Bitcoin is like holding a company, and completely selling it might be a wrong decision.
I agree with your comment. Bitcoin investment is a business or company.You are investing slowly for 6 to 10 years and gradually growing your business. When you reach your goal, selling the business is nothing but a fool. Hey, after achieving your goal, you can invest some money somewhere else or do whatever you want. So selling the company is a fool. Gradually, as time goes by, I am a Bitcoin investor and I am sure that the value of Bitcoin will increase and never decrease. There are many whale investors in Bitcoin now. They have accumulated a lot of Bitcoin.
I disagree with you to some point because Bitcoin investment is not really a company reason because there are people who will just invest very little cent and there are also people ( investors) who will invest big cent, so the investor that invested a little cent can not call his or her investment a company but rather it can been seen as a share. Bitcoin investment is just like buying share from a company and keeping it for some period of time so that the value will increase and some people don't just buy and sell they keep on buying and holding. First, you should know or understand that the idea of buying Bitcoin is not to keep it or store it in the wallet forever there is a stage you will reach ( matured stage) you will have to sell some either to use it and enjoy your years of holding or sell to diversify.