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use sandpaper to sharpen it into the form u want but use a low grit u dont really need something so rough to do it sand the tilted side of the blade but dont do it too quickly u gotta do it slowly so u no how much is gone

Exactly, just like thebanshee said, just some advice to it, lay the sandpaper on a flat surface and go with the “blade” over it. Like one would do with a real knife on a whetstone. Don’t forget making an angle when you reach the bend part towards the point of the blade.
After finishing sanding, you could use some polishing compound/cloth.
Good luck and happy building