If you really like maths you can consider aiming for a degree in pure/applied maths + research itself, which opens to a lot of doors that even I might not know.
For starters, the corporate world uses a lot of financial mathematics and algorithms to make money or just understand more about the world before let's say marketing a product, or organising a given campaign.
Actuary was an example given above, which is a well-paid career where people use mathematics to evaluate risk associated with insurance and investment, and do many things like formulate and price insurance products, and assess risks related to certain events such as natural disasters.
Other applications of maths include engineering, physics, and academia, which are more well-known for the average high-schooler.
If you are really interested I would recommend reading more mathematics textbooks beyond the VCE Syllabus to see what it's all about, note that Uni maths is taught very differently, and your experiences and opinions on maths might differ when you reach that stage.
Good luck