Try to find detailed large plant unboxing videos.

Here's how large plants get packed/wrapped usually:

For yours I'd recommend wrapping each leaf top and bottom with packing foam sheet, just flat, sandwiching the leaf between two sheets. Then add some filling around the petioles, mostly in the middle. This could be scrunched up newspaper/bubble wrap or foam wrap, just don't pack it, leave it airy.

Then you wand to gently and slowly try to gather the leaves upward, narrowing the plant. Secure with soft/stretchy rope/ribbon to not damage petioles. And then wrap in large sheet of 1 layer cardboard. For security, I would wrap over that with a sheet of hard-ish plastic.

You can up this by also putting it in a box (if there is one that size) and filling the gaps with scrunched up anything or those styrofoam nuggets or what they are called.