How do the NZ Police deal with historical COCSA?

I’m wanting to come forward about COCSA that happened to me. (Child on Child Sexual abuse) but don’t know how to go about it. The first one I was 6 and the perpetrator was 13. The second one I was 11 and the perpetrator was 15. Is it worth my time or would nothing come of it? There’s no real evidence but I want some kind of justice. (Potentially old Snapchat messages if they can see them). Particularly for the second one as I see them doing it again, and for me it happened almost daily for years. Even just to get a black mark against their name would be enough for me. I mainly want to do this as I still have to see this person sometimes and I hate how they talk to me like they got away with it.