Please let me know,how to get another few days more for an order.
The Fiverr Help Center is your friend. > https://support.fiverr.com/hc/en-us/articles/115003087828-Deliveries
Go to order page . In right you can see >> Are you having an issue completing this order?
Click in Resolve now. Choose option other. Write why you need extra time. Click continue. Choose Extend Delivery Time.
To increase delivery time , you must need buyer’s approval
you are correct man