The lesson
Make the newsletter archive a reading surface: a sidebar of issue numbers and one-line titles beside the live issue.
A left panel carries a short description, a dark "Subscribe Now" button and a "Browse Archive" list from Issue 411 "Nothing personal, just grifting" down to Issue 405, most with a one-line title. The right side shows Issue 411 on a peach header with a line illustration and a Nietzsche quote, then "Hello discoverers!" and a personal story.
Don't copy the illustration style or the peach palette. Keep the archive-as-sidebar layout with the subscribe button sitting right above the issue list.