Option 3, is good imo.
Although it seems you are inclined in keeping piano, so it's ultimately up-to you, what are you planning to do in UNI?
Does it consists of ALL the three sciences?
Your subjects currently aren't the best but you can still get a really good ATAR.
Advanced English at the moment looks like your highest scaler, then Legal studies, Biology, Business studies, General Mathematics and lastly Community and Family Studies.
- Economics is a really high scaling...