Let us find someone who can build or migrate pre-existing site to Jekyll for you.
Once you submit the theme/template, add this shield at the top of your repo README.md file
<a href="https://jekyll-themes.com/[GITHUB USER NAME]/[GITHUB REPOSITORY NAME]">
<img
src="https://img.shields.io/badge/featured%20on-JT-red.svg"
height="20"
alt="Jekyll Themes Shield"
/>
</a>