I def recommend doing Doe!!
However, Pethmin is right (kinda) because Silver and Gold tend to be considered for University (adjust factor points if I recall correctly), so Bronze is not really worth it in those terms.
However, if you do not do Bronze in Year 9, you have to do extra time (6 months if I again, recall correctly) for Silver and Gold, which will delay your award. Bronze DoE also benefits your resume and it saves you time getting assessors and signing up for your volunteering, physical recreation and skills if you do Silver (because you do not have to repeat the same process again and just continue with what you are doing for Silver).
I don't know how many extracurricular activities you do, how long it takes you to go to school, etc, but I def recommend doing Bronze. I didn't do Bronze since I thought life would get busy, especially with an accelerated course and the time it gets to school, but I still would've had the time to do Bronze. I also recommend it because you get to know your cohort better and the qualifying hike is pretty fun! You can also do volunteering and physical reaction with your friends so it's really fun!!!