Thank you for your reply. I intended to apply in December 2019 because my experience and age will increase my overall points. So, by December 2019 my points would be 70 through visa 189. Breakdown of it is below:
Age: 30
Qualification: 15 (As ACCA member equivalent to AQF 7)
Language: 10 (Although currently my IELTS score is 7 overall but my band in writing is 6.5 so I believe I can easily manage to get 7 band in each component in this month's attempt)
Overseas Experience: 5 (As my total experience falls under 4-5 years but post qualification experience is 2.5 years)
Single: 10
By the way, as I mentioned in my original post, my elder brothers and one sister are Australian citizen so I believe they would prioritize my case based on it.