Finally I am not getting any traffic from Google.. Why ?? Please Help

Hello DP Members,

I Build my website in HTML in 2009 - 2010 and done alot SEO for it getting 200 Daily Unique Visitor's at that time. Then for saving my time i switched my website from HTML to Wordpress in 2012 Surprisingly after switching now i am getting 10,000 unique visitor in a day ... Don't know why .. I thought it is because of my old domain name and the seo done by me in past..

Now the problem is i don't know what happen since last 2 months my page is getting crawled by Google Sir but it is not getting any rank. and my daily visitor's now went to 500 a day..

Please Help me out ....

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