See I was able to help a fair few people in Sydney fix all lag issues with PS4 ESO.
But it took some serious troubleshooting I know people don't want to hear it but 8/10 it's due to personal connections and ISPs.
I'm from Sydney as well as a good 20 other people who had issues which no longer are. But if you're not prepared to spend X dollars and X time then I'd advise to look elsewhere (other games).
Sucks I know but what can you do aye!