The number 911 does not man bad luck. In fact, 911 is not bad at all. See individual numerology answers linked from the What Does This Number Mean? page.

When the digits 911 are included within a larger number or series of digits, then 911 has no special significance at all. It's the whole number that is important, not a set of digits within it.

That being said, I notice your name number, your vowels number, and your consonants number all are the number 9. (The "1800" in your new number in Australia also reduces to the number 9. And "Australia" has 9 letters.)

I also notice your birth date number is the number 1. In addition the birth date contains both the number 11 and the number 1.

911 is not unlucky. Unless an individual is unfortunate enough to believe so and, because of that belief, attracts unlucky events. The Universe does tend to provide what we believe it will.