First of all its good that you gained a huge profit from your investment into Bitcoin.

Now to answer your question, both of them have pros and cons. I will share some of it.

1. In the first case, the pros is like you said it can secure your future with that and knowing cryptocurrency as a very volatile market there is a chance that you need your money but you don't want to sell it because you will be at a loss. I'm doing this kind of thing. Investing a portion of my money in a lesser and for long term investment like the stock market.
2. Reinvesting in Bitcoin might be a good idea but normally those who can't bear a huge loss are considering cutting losses when they see it. As long as you aren't that much affected on that investment and it can't affect your lifestyle then you might put some and hold. Aside from my stock market investments, I'm also holding Bitcoins for the future.

After all, it will depend on you. You can do both reinvesting and having some profits.