What's should be the salary of a Store Manager Handling Multiple Stores?

I'm currently a store manager for an e-commerce business based in Australia. My salary is $1500 USD per month with around 160-170 working hours.

My client is starting 2-3 new businesses and he wants me to handle those too. My hours would also increase. Once I handle those new businesses, I would ask for a salary increase.

For VAs with similar role like mine, what should be the salary rate per month?

Main Roles:

• Admin and operational support
• Order processing
• customer service and after-sales
• Market and competitor research
• communicating with suppliers and resellers
• Website and product update
• collaboration, training and managing team members.
• social media management, marketing and advertising