How to repair this damage on the closet door?

[Shantify]

I have an old wardrobe in a children's room that I would like to repaint. However, it has a damage where it has cracked open. How do I fix this best? Knife and filler? Or do you dare to use a sander for this? Grateful for tips and advice!

 

[Leif i Skåne]

Buy a new wardrobe door!
Much cheaper than trying to fix it, the door is cracked.

 

[Shantify]

Have been searching but can't find any with the right measurements. There are two sitting next to each other with different measurements. It becomes a bit too costly with custom-built ones, so I would prefer to try to repair first!

 

[ralvejd]

Remove the door.
Remove hinges.
Apply slow-curing epoxy into all cracks.
Place plastic film on both sides of the damage.
Place a straight and fine piece of wood on both sides of the damage.
Clamp with two clamps.

Coffee break 24 hours.

Remove clamps, wood pieces, and plastic film.
Sand.
Paint.