As time passes, your personal circumstances may have changed. You may have a new job, new addition to the family or unexpected costs arises. A change in your circumstances can mean it may be time to review your home loan to ensure it is still appropriate for you.
Refinancing can help you with:
Having more flexible repayment options
Lower interest rates
Offsets & redraw facilities
Fixed vs variable
The right loan can help you pay off your home loan faster which is a step in the right direction.