I use Wordpress for my content site. Currently, my blog post structure is site.com/category/blog-post-title. Unfortunately, many blog posts are in two categories, and Wordpress makes two URLs for each title. The problem is, I only learned about this after two years of blogging.
I plan to change the URL structure to site.com/blog-post-title and remove the category from the URL.
However, due to Wordpress limitations, when I change the URL structure, it will change all of the old URLs, too. I get 95% of my traffic from Google searches and rank #1 for most keywords in my niche. I'm very afraid that if I change my old URLs (I will set up 301 redirects) that it will impact my traffic.
How worried should I be about the impact on old URLs? And for new URLs, will having the category name missing impact SEO? An example category would be the city name, which I assume was positively affecting SEO.
I don't know a lot about this so any suggestions would be appreciated. Thanks!