Buy 3 hero member accounts, join a campaign like bit x which pays 0.0008 per post and you can post maximum 150 posts in a week which payouts comes to 0.12 for one account per week and 0.36 for 3 accounts in a week..CHEERS 
I think its hard to buy hero account because its very high price than low rank.. also you cant join right now in bit x and they are not allowed multiple accounts.. but good luck if someone follow this step don't expect that you can get into bitx..
and it will be very difficult to make a post 150/account, it means that in a week you have to create 450 posts
Really difficult to earn 0.3btc per week, the most reasonable way to earn 0.3 is by doing freelance job, plus with faucet and ptc