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Hi Akira
PPC and Organic position in the SERPs are not related. But you should continue to use PPC. SEO and PPC are complementary. Using the two increase your visibility.
In the SERPs the CTR is about 20% for the ads and 80% for the organic results. But the most people, companies, use 80% of their budget for the ads and only 20% for their content. You see where is the problem??? 
Regards,
Jonathan
Hi,
More inbound links from great domains will give a better PR. With a great content and good ideas (infographics...), the links will come.
Hope this helps! Best of luck with your SEO.
Jonathan