I have a old sitemap dated 2012 that I submitted in Google Webmaster Tools. I want to resubmit a modified sitemap, but I am worried that my current ranking might suffer.
Does anyone have a way that I can resubmit and make sure my site's current rankings don't drop?
(Re)submitting a sitemap does not affect rankings. All the sitemap does is tell search engines where to find your content. So changing your sitemap's contents will not cause a rankings drop. (Many sitemaps are dynamic and change daily if not hourly or minute-to-minute).
All you need to do is update your sitemap. No need to re-submit it or anything. It is automatically recrawled periodically by the search engines.
