Question about Vietnam itinerary (10 days)

I have around 9 days to explore Vietnam, starting from the 30th of April (arrival at 9 PM) to the 9th of May (departure 9 AM).

The skeleton for my itinerary looks like this:

Ho Chi Minh City → Mekong Delta → Ho Chi Minh City → Overnight Train to Da Nang → Hoi An → Hue → Phong Nha → Ninh Binh → Hanoi

Hanoi will serve as my departure city so I won't really be spending time there.

Anything you would swap out, flat out remove or add?

Thank u!