There could be many problems due to which your articles are not ranking, like
1. The articles might not have indexed at all.
2. Your content might not be SEO-optimized.
3. The keyword you would have opted might have higher difficulty levels, or the keywords you are using may not have high search volume.
4. You may not have created any backlinks or the one created might be toxic, and low-quality backlinks. And the Domain authority is lower.
5. There be might be the issues of Duplicate content.
Solutions to the above problems:
1. Create an XML sitemap; it helps Google to find your website pages easily and index them quickly.
2. Optimize your site for SEO, create H1, H2 tags, create relevant internal and external links. Internal links help increase your page authority, and external links increase your website authority.
3. Choose the keywords that have high search volume and have Easy - SEO difficulty. Use some of the best keyword research tools like Ubersuggest, Semrush, and Moz.
4. Create high quality and relevant backlinks. You can get free backlinks from and Quora, Medium and various other sites having high domain authority.
5. Plagiarized content will never rank on SERP. Avoid this, check your articles in Copyscape premium or Turnitin and considering removing all the content or rewrite them to make it 100% plagiarism-free.