Posting the same thing over and over from a new account (before you have a track record of good posts and comments) is likely to trigger HN's filtering mechanis

Posting the same thing over and over from a new account (before you have a track record of good posts and comments) is likely to trigger HN's filtering mechanisms. New product posts should be submitted as Show HN. If a Show HN doesn't get upvoted, it might be because people don't find it interesting, or you might just be unlucky. Things fall through the cracks. Keep working on your product and participating in HN with good submissions and comments (about things other than just your own product), then try again a few weeks later. You can also email the moderators (hn@ycombinator.com) and they can give feedback on how you can improve your submission to get it more attention.