Heck, what was the last animated superhero show that wasn't comedic? Young Justice comes from a different era, and Invincible is from netflix. All Marvel and DC do anymore with animated shows is comedy. And Diana could work as a comedy, but the comics don't reflect that. Her mainstream stories are mostly so serious and dire.
Bringing back the original Etta Candy and the Holliday Girls could do her a giant favor in that regard.