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Me personally wouldn't recommend Sitemap (
latest copy may help), as it only shows the headers more of modules, and it won't search your site as much.
Next depending on what keywords you are using....... rome wasn't built in a day....
Adding your site on here helps loads, as search engines like Xoops....
Add your site everywhere you can, the more times any search engine see's it, the more it will like it and put you at the top....
Search engines see XOOPS well, make sure your Meta words are not to long or short using any meta test to see whats the longest.....choose good words, that match page contents overall.....