Sadly, the bots feed on text... those with more text get more attention. Niche sites rise only if they have material the others do not... and once published (and scraped) that advantage disappears. What helps more than all the new posts one can do, is getting good, solid back links from authority sites. That's the real leg up for most. And there's nothing wrong with continuing to create new content... that's how one gets to hundreds of pages and ultimately thousands of pages.
where I struggle to post new ones
If content creation is a true struggle, it's possible the content might suffer, perhaps not be as good as desired. Instead of posting one-a-day not so good articles try posting one-a-week best effort articles. Content, and quality of content, do pay off in the long run.