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Provide equally valuable or more valuable content and you will retain your position. The search engines allow new content to be tested to see if it will cement. Failure to stay up to date and relevant will give you competitor the advantage. If the railroads would have innovated and stayed relevant then you and I would be flying with Western Pacific

Hi Karen. I can appreciate your desire to keep your #1 ranking, and not make any changes to the page. Your fears are valid as any "improvements" you make to the page can impact your ranking. It's a tough spot. Google wants to provide users with the best experience, but by making changes to improve that experience you risk the #1 spot. I took a look at your page and your SERP and have a concern. Your title in the results page shows as "Per Diem - Nursing news, career resources, RN jobs and nursing..."When I visit the actual page, the title is "Nursingvillage.com - Career Option". If that was a recent change, I would suggest it is a bad one and should be corrected. It would be a reasonable cause to lose your #1 ranking. A reasonable title for the page would be "Per Diem Nursing | Nursingvillage.com". The rest of your title would be best left for your meta description. As far as why you are ranking #1, the term "per diem nursing" only receives 3600 global searches per month according to AdSense. It's not that competitive. Compare that with the following keywords which receive more global monthly searches: nursing jobs - 1,000,000 nurse employment - 673,000 nursing job employment - 550,000 nursing positions - 301,000 jobs for nurses - 246,000 "Per diem nursing" is a long tail keyword phrase which is why you are ranking so well.