You can easily earn that amount if you have multiple ways of earning bitcoins as you cannot expect that income only from single source of income so try to multiply your ways of earning from sig campaign, trading, gambling etc.
That's the way of earning that amount per week and you shouldn't have enough time for doing it so. But I don't want to include gambling as your source of income, it may be good if you are an investor on a certain casino but for being a normal gambler, I don't that would help as it will always lead to losing a lot of money.
Thats right, you need multiple source of income if Op want to earn 0.1 bitcoin per week. You can do it signarure campaign by posting you can earn bitcoin and it is totally free, Trading buy coin with the low price and then wait the price to increase before you sell to make profit. Thats right also i dont think gambling help you to earn bitvoin unless you invest your bitcoin in online casinos but playing gambling is not good they have possible that your bitcoin loss if you play that.