Broad stroke drops in Keywords on a good site
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Any thoughts on why there would be an across the board drop in keyword ranking for a site that hasn't changed any of it's content marketing strategies? All above board and DA continues to be strong. All indicators that the site is healthy. Many competitors in the space (in Australia) continue to rank in the top pages with little change.
As an example take the term "web design sydney" the leading pack here have ranked for 3+ years with very little change and rather consistent questionable tactics. It's a mystery.

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Hi there
Check out this great answer from Andy Drinkwater in this Q+A thread. You also have to consider your industry and the keyword difficulty. Check out the on-page grader as well, this can help you prioritize what steps to take.
Hope this helps - good luck!
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SERP position is clearly relative to other sites. If they are generating links of a type and at a rate that Google favours more than your activity you will appear to drop in ranking. Anyone still see the 'Google Dance'?