The best way are signature campaigns but you can also offer services and earn a lot. My record is 90$ in one month. Good luck! 
Wow you have a decent earning for a month on signature campaign there pal. Me im earning almost $100/month which is a very big help for me to my expenses and some other needs to be buy thats why im grateful that bitcoin was invented to give this kind of opportunity.
That is a pretty large amount but you are indeed right about that that is the funny part, signature campaigns are very profitable but can sometimes provide you not a lot its depending on rank and campaign.