I’m trying to get some further confirmation from Facebook but I ‘think’ they are testing completely replacing the like with the follow button across all pages.
They often test things out on small groups of users first (and often in NZ) so you were probably part of the early test. I’ve just noticed that I now only have the option to follow pages and not like any. So either they’re testing to a wider group or it’s actually rolling out. I’ll report when I hear more.
You definitely shouldn’t start again!
You’ve done really well to build a following of 10K+. It an be hard to grow beyond that for a lot of businesses in NZ so I don’t think you need to focus on it. You’ve established yourself as having credibility and popularity which is a key reason why fans and followers are good to have, so the focus should now be on website traffic and sales.