the fastest way would be to buy them
Otherwise signature campaigns seem to be a way to earn.
But the rank needs time.
So, there is no fast and safe way to earn bitcoins. Otherwise everybody would do that.
I think while you have a large capital you can earn money quickly certainly problems rank on your account you can get around it by buying account. yeah I say that capital is very important and helpful besides that many methods such as trade or binaries that need capital where you can earn money fast there
Even buying higher account is not recommended at this stage as majority of campaigns are closed for new participants so its better not to invest there at a moment.