Have you been playtesting the One D&D rules documents from Wizards of the Coast? Try these options for inspiration!
OSR The World of PhilosopherZeus
Creature Codex — Stygous
Player's Guide Upturned Table -- Tabletop Everything From
Kobold Press' Creature Codex on Kickstarter – Wanderers Haven
What Do I Know About Reviews? The Underworld Player's Guide (5e
dnd Archives - Page 9 of 73 - Kobold Press
New Unofficial D&D 5e Supplement from Kobold Press Now On
Boss Fights for 5th Edition - Kobold Press
Journey To A Realm Of High Adventure With Southlands TTRPG For
The 4th Pillar: Adventure Isn't Balanced - Kobold Press
dnd5e Archives - Page 8 of 59 - Kobold Press
If you haven't heard of Kobold Press, they produce 5e material
Show Off at the Gaming Table!, Whether you are a novice player looking for guidance on how to master the intricacies of your very first character or
Playing with Class for 5th Edition
One-on-One Roleplaying: Adapting PCs - Kobold Press