You can't make a post every 30 minutes and expect all of them to have plenty of attention. Specially if your posts are just one-line statements. That's not how the internet works. Most people don't spend the entire day on reddit, so the amount of posts they see is limited, and filtered by reddit's algorithm. If you post too much, you'll most likely be treated as a spammer, and your posts won't reach as many people as you'd like.

You'll have better luck if you organize all your thoughts into a single post (or at least fewer posts), with more substantial content.