If you are looking for a professional job, e.g. IT, accountant, engineer, it is quite common to take 3-6 months (sometimes much longer) to find your 1st job in Australia. 

There are many different reasons for this issue. However, following are some of the reasons, which might cause a delay in finding your 1st job. 

1. Probability theory; within this period (3-6 months), you would have had enough applications & interviews to get a job!

2. During this period you would develop "local" culture traits

If it is the 1st reason, you cannot do much about it. You just need to be patient. If you decided to leave your job when you were in your home country, it would have probably taken around 6-12 months to find a new job. So, relax and enjoy the ride...

If it is the 2nd reason, you can try making some activities to expedite the "localisation" process. Following are some suggestions. 

A. Watch local TV and/or listen to local radio channels. When you were at your home country, you understood 99% of what is said on TV. How can you expect to work with Australian if you don't understand at least 85% of what people say on Australian TV?!

B. Consider taking English pronunciation courses, e.g. https://cce.sydney.edu.au/course/OPOP

C. Get a non-professional job, i.e. security guard, waiter, cleaner, etc. This will improve your understanding of the local culture in no time!

D. If you find working in a non-professional job difficult (because of your pride), spend your time in Caffès. Sit there and observe people communicate. Observe how they talk, laugh and deal with each other. Do NOT play with your mobile phone. OBSERVE people.

By the way, most professionals in this country worked in non-professional jobs. Education is not free and parents don't help. Most doctors, engineers, etc. worked while at University in part-time jobs as waiters, cleaners, etc. This is one of the reasons why people have mutual respect for each other, regardless of their social status.

Following is a good article on the subject:10 Most Random Reasons You Didn't Get the Job

If you don't get enough phone calls from recruiters (around a call per 10 applications), you are probably either: (1) applying for the wrong jobs (jobs that don't match your experience), or (2) your Resume needs enhancement.

If you are getting only 1st phone calls from recruiters, but no subsequent calls or invitations for interviews, probably your accent needs improvements. The recruiters might find it difficult to communicate with you. Another possibility is that the recruiters found from talking to you that what you wrote in the Resume do not match what they heard from you on the phone.

If you are getting invited to interviews, but not getting offers, I would strongly suggest you read about interviews and discuss your answers with people who have local experience. Among many things, the problem could be in (1) your attitude and/or your knowledge. Most probably, it is in something you don't realise, e.g. you think that people who make mistakes should be fired, while in Australia, we think that people, who make mistakes, should be trained, among other corrective actions.

Please, check out the following question about the local experience myth (أسطورة الخبرة المحلية). 

https://newaussie.com.au/categories/jobs-recruiting/97-local-experience