Create closed polysurface

Hey, I got a problem with the attached palm leaf, I wanted to create a closed polysurface, but it doesnt seem like working… I’ve tried DupBorder, then Loft, also Splitting/Trimming but i guess the form is too complicated… (I just need a surface from the closed curve).
Can anyone help me out please?

palmleaf.3dm (2.6 MB)

Hello - see if the attached file is what you need -

palmleaf_Closed.3dm (1.7 MB)

The command used is WireCut, from the top view.