Right now it is not the best idea to make money on crypto currency. Maybe just investing will bing you some profit in the future, but not bounties or mining, because difficulty is too high, prices are very low and no project is able to collect enough funds.
I don't think that only investment can make a profit. When we invest in a coin, of course we hope that in the future the price of the coin will increase and give us profits, but we do not know what will happen later, we can only get profits and we can also get failures. There are many ways to generate profits from cryptocurrency based on a way that matches what someone wants to do, whether it's trading, investing, mining and also doing bounty hunting.