Dr S Manaharo tested opening his practice different hours. In the first week alone, revenues were up $2,000. What hours are you open? Could you test other hours?
Work with an external accountant for tax planning. A good accountant will never cost you money, they'll save it for you, make sure you're working with someone good.
Have a system for payroll and superannuation. It shouldn't take you long at all if you're following a simple and easy to use system. Or, even outsource this function.
Complete a purchasing system for all interanal purchases. Don't let anyone spend money until they've got an authorised purchase order, create a simple system for this.