I know you just launched, so you're probably thinking about this already, but from what I've seen in the loginless browsing link, discoverability is nothing like reddit. It just feels like an unorganized dump of content, like I accidentally opened a link to a spam blog, or opened the "federated" tab on a mastodon server.
If I was looking to join a community, I wouldn't know where to start. I see tags under random posts, but it seems like some posts don't have tags, and I can even add tags to other peoples' posts myself. It all seems too fluid and ephemeral, and I have to spend too much time trying to connect stuff together in my head. By contrast, it's obvious how a subreddit works to most people, and it's easy to find the content you're interested in.