Well just like any other investing you have to make a bet and turn out to be right. If you're just asking where you can make bets, there are platforms for Bitcoin loans, stocks, altcoins, and many other investments. Almost all of them are money-losing of course, but there are opportunities sometimes.
There is a chance to lose that is why it's called investment because it's a way of taking risk using your money hoping for a success.
Bitcoin provides great opportunity for it's supporters because with it's popularity a lot of people will be using it for online transaction and it can be in a lot of ways.
Only the demand will make the price increase and we have seen a lot of factors already that is vital for the success of bitcoin therefore we have to continue investing so in the long run, we will be reaping a good amount of profit. Investing could be less risky than trading but trading is the best way to grow your bitcoins.