Wait until you got a legendary rank and earning .1btc is possible for you.
It may took time but earning a merely 0.1btc is really easy. But rather waiting for that to happen then why not just find other ways such as trading, or joining altcoin campaign. You may earn a lot on altcoin campaign whenever the project is successful.
Earning 0.1btc isn't really easy without having any starting money putted into it. Maybe if you become Legendary rank then it would be easy but just as you've said it will took time to go into that rank. Regarding about what you've said about joining altcoin campaign then I suggest my current campaign which is Humaniq. You might earn 0.1btc.