I can write a 2000 word essay on what you should do in Year 8, a time I believe where I personally believe a lot of us failed to understand how much time we had on our hands compared to senior years and how precious it was to make a huge step. I won't cause I believe in you.
I regret (stop using this word) not giving an absolute crap about my Maths. Of course, I had my own struggles but it was nowhere close to Tyler Butler-Figueroa's. While you still have time to grow believe it or not, if you're serious about taking a pathway that requires mathematical knowledge I recommend sacrificing a lot of 'free time'. In a couple of years, you will realize there's no such thing as 'free time', this time is literally your own time. This time should not be used to relax but to invest yourself in a few quality textbooks that actually explain how the method/working out and get cracking on the topics (the understanding required not just steps or skipped steps) and do every single question. When I mean 'every single question' you literally do all of them. This may seem rigorous and stupid but you will suffer less in the long term. If you don't you'll most likely struggle in later years like me and dread Maths. This way, everything becomes muscle memory (Year 9&10 Maths knowledge) that is applied in General Maths or the Year 12 level of the subject called Further Maths. You don't want to catch up on this foundational knowledge in VCE, trust me.
WARNING: Don't just rely on your textbook answers. Sometimes they may even be incorrect (at least for VCE Maths textbooks when they use the CAS to check the answers and this results in an inconsistency; check for all possible solutions).
Then how do we know if we're right you may ask? That's why we invest in excellent textbooks that actually explain how you should interpret the method and gain a mathematical understanding not just telling you what this step is called. If you're not a pro gamer or avid gamer, for instance, a new gaming subscription won't help you get "better" at Maths.
Best of luck you have unlimited potential still.