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There are some good points in the other answers, but honestly do the course. With all due respect a lot of what the other answers are covering is minor detail compared to the big picture stuff that you are missing.  You need to understand that stuff if you want your site to do better. Simply following check lists of technical issues will not get you the big jumps you probably want. The course will take you through the process.  It will help you understand how to identify the keywords that are going to bring you traffic, how to target those keywords effectively, how to spot the sort of issues that others are pointing out and how to build the authority you need to rank for those terms. I'm not knocking the points others have made. They're all good. However you really need to understand the basics properly and then come back and work through those sorts of points. The good news is though that if you are getting those traffic numbers from the site in it's current state it has potential. It should be well worth getting this stuff right.

Happy to help anytime. Look forward to catching up with you around SEOmoz as you settle in to the community Sha

Very good, Dr. Peter. Thanks for your explanation. I think I am now beginning to understand.

Hello jobintourism, Thanks! I understood. So, I have already signed up for the 1 free month. I'm just find a little complicated to understand the reports and take the necessary steps. But I thing I'll learn with the time.