When creating your RSS feed (with Libsyn at least), you're able to select three category options.
However, Apple will only recognize the first category selection that is listed in the feed so make sure it's the most relevant one.
There are two options for categories; Main and Sub-Categories.
If your hosting service has these updated their platform with these categories, you can go ahead and select/update them now and they will be automatically updated when Apple releases these new category options in late summer 2019.
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