Game Master’s Journey is a discussion podcast for GMs and players of Dungeons & Dragons and other tabletop RPGs hosted by Lex Starwalker. The show explores strategies players and GMs can use to enhance the gaming experience for everyone at the table. Lex also discusses the creation of his homebrew D&D setting, Primordia, providing a valuable worldbuilding resource for DMs creating their own setting.
https://lexstarwalker.com/gamemastersjourney/
episode 116: GMJ 116: Worldbuilding 18 - Exploring Your World's History for Variant Campaign Settings
If your homebrew D&D world is anything like my world, Primordia, then it was a very different place at different points in its history. Exploring these other time periods can yield the perfect campaign setting for a different kind of adventure you want to run. Whatsmore, using the same locale in different time periods allows you to easily make previous campaigns more relevant.