As an investment, you could try to utilize some of the profits to invest in other Alternate Cryptocurrencies that also has the potential to grow and surpass their current values. That is one way to earn more from the investment that you have made to Bitcoin since its all within a single industry. Another thing that we can do is create a physical business since that we can turn our Cryptocurrencies into tangible cash with a process and then by creating that business we could create more income and its not just from the Crypto Industry.
You have to be careful with this one advice though, the chances that an altcoin is a shitcoin is pretty high in most cases, they are just a fool's gold. What I think is a better way to grow the money is to invest it on gambling sites although the problem with this one is that there will be days that has losses but the profit outweighs it greatly, it is more better than just hodling your bitcoin and let it sit there and wait for the prices to grow when you can invest it. Take precaution as there are a lot of investment scams and it is best if you research and consult with people that have invested their bitcoin in a gambling site.