Hi,
I don't know WIX in details but you can embed all StoryMaps through a standard HTML Iframe which most of the hosting platform should support.
In Map Journal we gave you the Iframe code through the little chain icon in the header, it looks like:
<iframe width="100%" height="800px" src="http://story.maps.arcgis.com/apps/MapJournal/?appid=c3b8d991a0f24769a0f899d71201823b" frameborder="0" scrolling="no"></iframe>
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If you are not using Map Journal, just modify that code with the URL of your StoryMaps and should be good.