Please don't use multiple accounts to promote your stuff on HN and definitely don't do voting rings. This is in both https://news.ycombinator.com/newsguidelines.html and https://news.ycombinator.com/newsfaq.html.

Note these from https://news.ycombinator.com/newsguidelines.html:

Please don't use HN primarily for promotion. It's ok to post your own stuff occasionally, but the primary use of the site should be for curiosity.

Don't solicit upvotes, comments, or submissions. Users should vote and comment when they run across something they personally find interesting—not for promotion.