Have you been playtesting the One D&D rules documents from Wizards of the Coast? Try these options for inspiration!
The 4th Pillar: Adventure Isn't Balanced - Kobold Press
Creature Codex for 5th Edition (Hardcover) - Kobold Press Store
A preview of D&D's Journeys Through the Radiant Citadel level 1
The Ultimate Free DnD One Shots Guide - Eternity TTRPG
Divine Purpose, part 6 - Kobold Press
Kobold's Press System has been officially named now. Instead of
New Unofficial D&D 5e Supplement from Kobold Press Now On
Journey To A Realm Of High Adventure With Southlands TTRPG For
Project Updates for Deep Magic for 5th Edition: A Tome of New
Kobold Press' Creature Codex on Kickstarter – Wanderers Haven
For DMs Archives - D&D Duet
Matt Carlson: Gen Con 2021 – RPGs