0.1 per week is like a minimum wage is some poor contries, or more...
There's no secret, just work or create something new and useful and put people working for you.
I think you belong to elite country, isn't right? But there's something i'd like to add on by earning 0.1
BTC per week. Always do some trade in the exchange platform then observe the traders over there on which altcoin is movable that they invest in, and read there forum in the section it might help you as well on which coins you are going to invest in.