I can't manage to get many new members, can anyone help me or give me some tips?

Can you provide us with some more information, without disclosing your actual site? (We have an anonymous policy here).

You're looking for SEO (Search Engine Optimization), and the best site I know is:
http://www.highrankings.com/
google will find many more, but check the FAQ, the articles and the forums and you'll find out all you need.

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