Trying to fix a website that was built with WordPress and then taken off of it

Content

If you have no database copy/backup, and the site is entirely static HTML, then you’re going to have to populate it by hand. You have a lot of copy pasting to do

Theme and Styling

You’ll need to take a minimal theme such as underscores, and copy over the styling and HTML, plumb in the post loop and important PHP such as the header and footer function calls etc