Article was recently published and is now indexed, but it is not ranking.
this means that google "likes" your page, but it doesn't fully trust it yet. I'd figure out a way to boost the trust and authority of both that page, and of the entire site overall.
More specifically, I'd work on...
- strengthening the topical cluster with more and better content (I do hope that you've used the skyscraper / topical clusters technique, this seems to be the most important content structure in SEO lately... at least for small / fresh sites, big ones are obviously exempted from many SEO rules that affect the little guy)
- strengthening / improving the internal links both to, and from that page to other pages within its main silo (category / cluster)
- strengthening the authority of that page, as well as of the entire site by getting quality AND relevant backlinks from other pages or sites in the same niche, or which cover the same, or similar content to the page of your site that got indexed
- strengthening the trust of that page, as well as of the entire site by getting traffic in other ways, as well as getting quality and constant social signals from real accounts with lots of engagement, from sites like TikTok, Instagram, Twitter, Reddit...