Tracking the source leading to the conversion

A tracked conversion on the site is clicking a link to an external site. This link is in several places on the home page (it's a sales page), and in the page header. This is already being monitored.

The site has a blog, a knowledge base and other sub-sites that also have a link to the home page.

At this point, I know how many conversions which sub-page generates, i.e. a click on an external link.

What I don't know and need is information on which sub-page, e.g. a given blog article, how many resulted in clicks to the home page and ended up converting.

The statistics used are GA4