Please don’t focus on, “going back is failing”. If you do end up going back, you should present it as “we wanted to give it a go, but it wasn’t what we expected” for example. You shouldn’t stay in the “wrong” country because of what people say!
Interestingly, your first post doesn’t even mention anyone local - making friends etc.
People come to Oz completely underestimating it from every angle. The one that really got me is “divided by a common language”. I honestly think I found it easier in countries where I didn’t expect to know the language iyswim. The idea that it’s a “better” life, is so naive, as you’ve said, it’s just different.
Anyway, I’m not going to say anymore, except we have been here 20 years, and I still would go home like a shot, but this is where my children are now.
I’d still wait, give it longer, but not more than 2 years. Anymore than that, and the kids will start having trouble settling back in the UK etc etc. also, the longer you leave it, if you do want to go back, and DH wants to stay put, you end up with some very difficult legal issues if you’re both citizens by the time you decide to leave.
good luck, listen to all the good advice here!