The only way you can earn 0.1 btc per week has two options.
1. You will have a freelance job and receive your payment in bitcoin.
2. You will be a good trader and make profit from altcoin trading.
The rest is hard.
There are many freelance jobs on the internet but not all jobs fit your talent and not every day you can get the job. Therefore you can not depend on this job alone. Maybe you can add another job