You don’t create a new topic in a topic, you simply click on the blue Reply-Button below the last post. Or do you see any sub-topics in the main topic Introduce yourself! 🎙️? I don’t, I’m only seeing answers.
Michelist
Add/Edit: And if you had had the fun of thoroughly reading or searching through the topic, you would also have seen that the introductory topics of all users who had created their own topic were merged with this topic. There can be only one!
Add/Edit 2: While skimming through the topic, I noticed that the merge comments found under merged topics, such as those we often see in the “Feature Request” category due to duplicate/similar requests, have either been edited out or not added to the “Introduce yourself! 
” topic in the first place. This applies to at least two requests that I asked our administration team to merge with this topic. 