Some suggestions are -

Answer questions here. I have earned 0.109 BTC so far.
Try coinchat.org. There you earn money for chatting.
Try using faucets with high payout and high time. Eg : energy24h.org , domesticpineapple.com , cosmosbtcfaucet.ciki.me
Try using bitcointalk.org . After having enough posts , some people pay upto 0.3 BTC per month for just putting the advertisement in your signature.
EDIT : I just found the fastest faucet ever ---> freebitco.in It gives an average of 0.14 mbtc per hour as compared to energyfaucet24h , the previous fastest , at 0.13 per 23 hours. It has a gambling option , but I do not recommend it.

The best part is the 1/10000 chance of winning an entire Bitcoin !