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.
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Money used for additional wealth Creation must not be the profit gotten from an investment rather additional wealth Creation or investment will definitely come from discretion. According to what the first user he said 'some portion' meaning that it may not necessarily be all profit that will be sold. That's why it is important that An investor should always have a discretion fund and or emergency fund to be able to handle certain situations when they arise . Profit is profit which is the output of every investment why discretion is their to serve the purpose to handle any situation like diversifying into other assets, except a critical one that will involve emergency fund. So each money has its function both emergency fund, discretion and profit. So profit can be used for reinvestment but it is important to allow it grow in your portfolio till the speculated time frame while the discretion does the work of additional investment. While emergency fund help to solve critical situation which is above discretion. But Bitcoin investment should be left alone till the time frame expected.
If it's not a good practice to call it profits from your buying investment and use it for diversification into other nature's of investment, else you're stagnant and not progressing in your accumulation journey. Your portfolio should remain tamper free during your accumulation period.
I kind of get the idea to invest into some business concerns that would yield you instant profits to help keep you more stable while purchasing Bitcoin and I would suggest you raise funds for that differently. You can identify a variance or more of your backup funds which has been built and divert the funds meant for them into building the capital for diversification while your Bitcoin accumulation remain untouched, I've done that before. When you must have built your capital to some extent, you can venture into the business and use it's proceeds to increase your aggressiveness or attend to other concerns. Your Bitcoin holdings and your consistency must not be threatened during this period so that you can win on both ends.
we both are saying almost the same thing if not the same thing. i earlier made it clear in my comment that profit can be used for reinvestment but it is important we let it grow in our portfolio till the speculated time frame. i also said that discretion fund is very important to use for diversification which makes it clear that profit should not be tampered with, that all fund has it function and not to be used for another thing so we are saying the same thing no matter how you twist it.