Custom Category Template Page adding ACF field to existing.

A custom WordPress template for the Jupiter X theme, it is an override for the blog-archive template which is currently to the best of my understanding displaying the categories. What I require is the addition of a more by author link if an ACF field is populated for that post. Clicking on that link should result in a new category page displaying posts by said author. The in-built WordPress author is the same for all posts. There is an ACF field name post_writer that has been so far used to auto-select the featured image. This task will require knowledge of WP Queries, WordPress Template Customization, and the Advanced Custom Fields plugin.