Fix google webmaster problem

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
That past week i have had problem with google webmaster tools, my impressions and clicks have fallen a lot.
See picture below:
I didn't made any changes in site code nor do i use blackhat SEO methods.
I need to get my impressions and clicks on the same level as they where below. ONLY apply, if you know how to fix it.
I have had previously problems with inserting sitemap.xml file. google webmaster gives me an error: "General HTTP error: 404 not foundHTTP Error: 404". although my sitemap has been uploaded to root directory and it's readable.

Also, i need to you do whitehat SEO for my site. So that i my traffic would rise 50% in next two weeks.
I have made over 9000 posts on my wordpress site.
Google webmaster problem should be fixed firstly, and if the problem is fixed successfully, we can go on with our business in long term.

Skills required:
Internet Marketing, Link Building, SEO, Wordpress
About the employer:
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