I have just visited your website, and it is clearly advertising paid premium services.
If you now make an article with the link to your page, it is, in my opinion, an advertisement and that belongs to the "advertise your stuff" forum. But without, depending on the content, the article could stimulate discussion.
As a stock forum moderator, I wouldn't mind. And if you don't mind, you could send me a sample article and then we can see further.
Of course, you could theoretically send one with a link in "Advertise your stuff" and publish the one without a link in "stock" forum.
In the end there is still the president and admin who make the final decisions .