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My home page recently dropped from page one in Google to not being ranked for my top keyword.  The page has an "A" ranking in MOZ for the keyword.  Is there a way to find out the cause.  I did have what looked like a duplicate page for a while 3 months ago when a domain was forwarding to my home page incorrectly.  Appeared with second domain name instead of primary.  Our business has been 95% through internet leads so quite an issue. Is there anyway to find out what is going on.

We discovered duplicate content issues because of errors in domain forwarding.  The forwards were masked so Google crawl thought all duplicate content.  Fixed now and any suggestion on how to notify Google?  just wait it out?