Wait until you got a legendary rank and earning .1btc is possible for you.
If you rank is legendary you cannot earn 0.1 btc a week because I think the payout of legendary is 0.03 to 0.06 only . Unless you have two legendary rank you can earn 0.1 btc a week for sure. Many people here for sure earn 0.1 bitcoin because of their alt account. But I dont recommend in alt account must better if you have only 1 account because you are focus of what you doing here.
Alt accounts are not good idea because that is not fair for other members here who are just using one account in doing a living. I still prefer 1 account because it is a good idea because you don't need to be confused in some thing because you only have 1 account. And one of the disadvantages of having alt account is a chance of getting banned in some signature campaigns if they find out that you have other accounts at the same time.