Welcome, Shansss!
I'm always excited to see fellow Australians joining the DV community!

Congrats on already achieving lucidity!
What generally happens after those 10-15 seconds? Do you lose lucidity and drift back into a non-lucid dream, or do you tend to wake up?
Either way, establishing some kind of grounding/stabilisation method could be helpful. I would probably recommend different forms of stabilisation based on whether you're getting too exited (waking up) or losing awareness (remaining asleep).

Starting a workbook in the DVA Intro Class would be a great place to get personalised advice and suggestions as you progress:
Intro Class

Good luck, and keep up the great work!