Look closely at thesection of your Web page. The subject, author, copyright, and publisher tags are NOT meant to be used as places to stuff keywords. This is called spam.
Never put keywords into these tags in an attempt to influence ranking. You are better to get rid of the tags altogether.
They’re not needed on your pages, (even if you’re using them correctly.)
There’s no reason to ever use the META revisit tag. A search engine
will not revisit your page in 7 days just because you tell it to do so in a Meta tag.
It is far smarter to work on “content freshness” and consistently add new content to your Web site on a regular basis. The keyword here is “consistently.” By adding new articles or other content on a consistant basis, you will trigger an increase in the robot visits.