I have a question in regards to blog articles and long tail keywords variation. I usually create landing pages for the services of my business and create related topics for my blog with long tail keywords (tips, best practice, etc.). However, by using this method, I am a bit worried about the ranking of the different pages/blog posts.
Here is an example
The keyword in this example is "office design". I tracked it with Serplab.
Then I created a blog post with a related topic 'office interior design tips'. Unfortunately, when looking at the ranking, the previous page (office-design) is not ranking anymore for this keywords and instead, the blog post office-interior-design-tips took his place. It moved from position 11 to 29 only because I created a blog post related to the topic.
Therefore, what happened to the previous page? does it stop to rank for this keywords once there is another blog post that is related to it? How can we avoid this fluctuation of ranking due to cannibalization? One can assume that by creating relevant content related to this topic, it should rank higher no?
Thanks in advance for your answers.