Reposting is officially allowed:

> Are reposts ok?

> If a story has not had significant attention in the last year or so, a small number of reposts is ok. Otherwise we bury reposts as duplicates.

https://news.ycombinator.com/newsfaq.html

While we're on the subject of following site guidelines:

> Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something.

https://news.ycombinator.com/newsguidelines.html

It's a cool site. I like the concept a lot.

With HN, often times things have to be submitted multiple times before they get noticed and "stick" and generate interesting discussions. It's very dependent on luck, and there are no rules against it AFAIK (aside from what the spam detector flags).