Go to town on preparing yourself for independent adult life.
Open a bank account.
Take on the food shopping and cooking for the whole family.
Get into nutrition as a side hobby.
Find out about good social skills and go out and practise them.
Find out about sales skills.
Start an ethical business.
Go on adventures and mini adventures. Such as visiting lots of free or nearly free places within 2 hours of where you live.
Do the car servicing or repairs on the family cars.
Decorate or renovate sections of your home, either the inside or outside bits.
Gardening.
Get in-demand high tech skills. Maybe as part of creating your business.
Listen to self-improvement stuff as you're doing manual labour type tasks.
Audit your life. Keep asking yourself "What else?" What else can I do with my time apart from what I'm doing. If there's something better; do that.