Unfortunately most Show HN threads are not shown on Show HN, they are shown in /shownew and /new for a short amount of time before other new threads arrive. To be shown in Show HN they must pass some unknown thresholds (upvotes???). I believe not many HNers visit /shownew and the chance to get upvotes on /new is quite slim due to the amount of new threads coming in. I know there must be some mechanism to prevent spamming but the current one also suppresses the exposure of Show HN threads and they are often buried in /shownew without much exposure/feedback.