As a fan of Ethereum, I've been able to make some ETH through putting my coins to work, but I've not come across putting your Bitcoin to work before.
Is all we can do as a Bitcoin investor is to HODL?
Is there any way to HODL and make more BTC?
I know that Bitcoin is a proof of work coin, but I am only curious if there is something you can do, while planning to hold your Bitcoin for 2 years or more, is there any benefit of holding and making more Bitcoin?
Also, What are those RSK Bitcoin for? Any benefit at all?
You could lend your Bitcoin in return for a certain percentage on return. But then again you would have to trust the person you are lending your Bitcoin to to actually pay you back and on time as well.
So for example say you lend someone 1 BTC for a return of 5% profit after 3 months. So after 3 months you get 1.05 BTC. And the effect of "hodling" will still not have been disturbed. You still hodl, you just actively do something in the meantime.
Lending can go wrong so make sure you have a legally binding document signed by the other party. But, I am not giving you law or financial advice, you can consult a professional for that.