YourSite.com with main keyword your ranking for/lower competiton. Link all sub pages to the categories page and that page to Silo page1 - EXAMPLE ONLY
Silo page1/a category page/keyword/supporting topic/
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
one post per category links to a post in the next category- ONE ONLY
interlinking posts example
Silo page2/a category page/keyword/supporting topic/
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
one post per category links to a post in the next category- ONE ONLY
breadcrumbs link the above posts
Silo page3/a category page/keyword/supporting topic/
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
one post per category links to a post in the next category- ONE ONLY
interlinking posts example
Silo page4/a category page/keyword/supporting topic/
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
subtopic/keyword/supporting post/higher competition
one post per category links to a post in the next category- ONE ONLY
breadcrumbs link the above posts