Keyword ranking high but not getting much traffic

[RuskinF]

90% of the keywords traffic goes to the top 3 positions in the SERPs.
The rest of the traffic is variably divided between other websites.
The page that ranks in the lowest part of the lower page will not get traffic at all.

You will have to bring that page to the top 5 of the results if you are to gain in traffic than right now.