Thanks for sharing this list.
Because of New Updates, Keywords Ranking is going down.
Yes, there is some updates on Google that's why keywords ranking is fluctuating.
No PPC is doesn't effect SEO. The main role of PPC is to get more traffic.
I didn't hear but yes ranking of some keywords went down.
No, You should not use same keyword.
Generic keywords are theme related and very competitive keywords.
Thanks for explaining CTR.
I did never hear about such Seo technique.
Definitely something is happened because mu website keywords also went down.
You should submit unique content in high pr websites.
Yes it become competitive. But with white hat techniques you can definitely rank. Good Luck...
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Separate names with a comma.