Take on more responsibility
Volunteer to help out
If you think you can take on more responsibility and you're looking for a more challenging role, make sure you volunteer to help out where necessary. Have a chat to your boss about it too – just make sure you're realistic with your expectations and don't aim too high if you don't think you'll be able to cope.
Once you've taken on that responsibility, try to demonstrate how much you are enjoying it. And always do what you say you're going to do. That way, you'll get a reputation for delivering results and being reliable, which is a great thing to have.
Create a new position
If you genuinely think there's a better way to do your current job or you see the need for a new position, it's worth talking to your boss about it. And as you're the one who thought of this position, and are likely to be the most qualified for it, this should mean you'll be able to take on new responsibilities.