Not show up for organic search engine results for a specific keyword

SERPs showing up in ways different than you expected/worked towards is not uncommon and most of the time can be attributed to incorrect on-page SEO. So, audit your content and pronounce more the keywords you want to highlight by proper H1/H2 and meta tags. Also, try to expand on your niche as much as you can by doing more keyword research and even paying attention to Google’s autosuggest. Paid traffic can help as well, but I think you can see results without investing for now (aside from the time investment…)