It is no problem if you participate in HN as a real person. That is, if you post comments and submit articles from a variety of sites that get some upvotes and slip in a few links from a site of your own that is great. If you sign up for a new account and start spamming links from your blog that will get you in trouble.
Thanks. I’m on here quite a lot for the past few years. Do you think the “show HN” is appropriate for things I’ve written? It seems it is typically used for products.
Here are the guidelines: https://news.ycombinator.com/showhn.html
If it is something you've written (blog post, etc) then you want to just treat it as a normal link.