Welcome to cake central. Whipped cream and strawberries is delicious but very fragile. the berries will start weeping fairly soon after they are cut. It would be ok for a few hours, but not for much longer.
This is what I would do:
Level the layer, so you have a nice flat surface.
add whipped cream to the flat surface, but not too thick
pipe a border around the edge of the layer to help hold in the berries
add sliced berries, keeping them inside the border.
add the top layer of cake.
I would decorate with whole berries, dipped in chocolate ganache.
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