Hi Joon
With the great recommendations from Ryan and Anthony, I would also suggest a couple more items:
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Focus on internal linking opportunities so high ranking pages can pass equity through the site
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Content Marketing Institute is fantastic at this
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Take a look at Sitelinks Searchbox
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Just a great search snippet opportunity
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What are frequently asked questions your company receives?
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Answer questions before they ask with content
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Provide guides, ebooks, tips, checklists, etc.
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Is there any content on your site you can repurpose?
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Videos, images, infographics, gamification, Q&As, etc
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Also, check out the Customer Journey from Google
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Any opportunities on different mediums?
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Take a look at this content audit for more opportunities
All of the above will help pass equity through your site and also give you opportunities to capitalize on long tail queries. Remember - content cannibalization is NOT a bad thing - it gives you so many more opportunities to rank for long tail and also associates your site with your industry's topics.
Hope this helps! Good luck!