P.S. As every category/tag you use is among the most Popular of all the tags the display is continually changing every few seconds on those pages so your blog posts exposure time at the top of those pages isn’t very long at all – it’s seconds. Most bloggers aren’t going to click through to the other pages to locate your posts. I don’t have the time for that so I won’t be searching for your posts.
Bottom line: If you are relying on the WordPress.com topics pages to provide the main flow of traffic to your blog then I suggest you recognize how limited that is going to be. IMO you need to broaden your focus, join social networks and start promoting your posts in them.