In bitcoin and start working in some campaign to get more and more of it, after some time you will see that it was worth of doing.
Signature campaign it's totally free you need only some effort, gives some hours and high rank to earn enought bitcoin or money and that's good because you can earn money even you don't have capital to invest. But if you want to invest I suggest to invest your to bitcoin after that you can try to invest your bitcoin to altcoin that help your bitcoin grow to make your money grow also.