Some keywords are not reachable in my site

[SEORockStar]

Hi,
I have a website that used to have some keywords indexed well and appears in the first 5 pages.
A while ago, I checked these keywords again and suddenly, I find my site buried and does not appear even after 30 pages. In the main time, I see topics older than mine is still in their position in the search.

The other problem, that I find Google not indexing my latest posts, only the old posts are indexed. I tried to update the sitemap, but in vain.

Please help!!

[jag]

Usually quality content posts with domain popularity leads in results even if it is old and if you don’t see your new post, try to use Google blog ping service and add your blog/site to social sites that fetch posts from your feeds xml or from Google feedburner.

Best,