If you have really invested so much money in Bitcoin, then of course you are in a lot of profit now. If you need a lot of money, then you can sell some amount from here, and if not, then of course I would say you should hold it. Because we have not yet entered the highest price of Bitcoin because it will enter a higher position in the future. We have seen that when Bitcoin started, its price was very low but it has increased a lot at present and the popularity of Bitcoin is increasing day by day.
Moreover, you can search in different places and see that Bitcoin is currently being invested in many countries of the world and companies are creating their reserves. Basically, this is to help them financially, so if you own so many Bitcoins, I would say you should never sell it, but rather hold it, something good will come to you in the future.