In terms of bitcoin earning signature campaign is the only way to get a steady income. At the same it also have its own risk with post quality and knowledge about bitcoin. At times you may get kicked from campaign which affects the earning. Trading also suggested which needs investment and the one with less risk is faucets but it won't give worthy income for the time you spend.
As many times said before, signature campaign won't give you steady income, and if it does, your stay in the forum might be lessen.
trading is good, but it needs knowledge and I think patience, a very long one. Faucets are good too, but as your demand to earn more bitcoin, you'll definitely consider other ways to earn because it will consume most of your time.