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.
Actually if you have a lot of skills there are many freelance jobs you can do like being a developer, moderator, admin, desaigner, etc. All you need is great skill in one field. Then there will be many people who will hire you and you will earn a great income