Since r/newzealand doesn't allow crossposts to there, it might seem hard to gain viewers to this subreddit without (annoyingly) advertising.

BUT

there's a "other discussions" tab on posts that are either crossposted or use the same link if it's an external site, inevitably, people will click these to see what happens, and some will click on the post on our subreddit, and might even check the subreddit more fully.

I've gotten a few dozen or even hundred views on my posts here doing that, it's not the most effective, but it's good for a small / minor effort, and it's better than nothing.