Dividers are the cheapest way to add structure to a plain-text page or newsletter. A row of box-drawing characters reads as a rule in every monospace context.
Collect a small set you like, and keep them in a note. fontstyle.io also generates decorative text, so you can match the header style to the divider instead of mixing eras.
Check the divider on a phone: long rows wrap and look broken, so keep them under about twenty characters.
Written by FontStyle - more at fontstyle.io.