Investing in Bitcoin is one of the best decisions you can make in managing your finances for the future. As mentioned in the topic, if you sell it now, you'll make a profit, meaning your capital will increase if all your Bitcoin is converted into fiat currency. It seems like you have been planning this business for a long time, I don't know how much capital you need to start it, but instead of taking a loan at the Bank which can burden you every month + interest, you should sell all your Bitcoins as initial capital to start the Business.
Now the best decision is in your hands, to start a business, don't forget to involve your closest family, maybe they have the best solution.