There are so many ways on how you can earn Bitcoins. You might need to invest your real money without having to think you are going to loose because it will definitely appreciate.  more so, you will definitely have to invest your TIME and patience. There are those who do bitcoin mining. Some relies on advertisements viewing and captchas but it is time consuming and the earning is super low. As far as I know, signature campaigns offer a lot of profit than any of these mentioned, except you are ready to invest alot of money. Once you're earning from the campaign I suggest that you put a little portion of it in investing. But be wise enough to know when to put in your money and when to withdraw especially now that the value of btc is a little unpredictable. Good luck!