It was never saturated. The peak was probably Thanos. Everything since then has been pandering to a more female driven potential audience that was never there.

It's not just female super heroes, which always existed and were popular to some degree (Buffy, Lara Croft, Zena, etc). It was a particular form of shallow female empowerment where the female characters were perfect, or if there was any growth to be had, it was realizing that they were perfect all along and the world just needed to change.

Take for instance She Hulk series, within minutes of gaining her powers, she was able to outperform Hulk. There was no personal growth. Whereas male superheroes typically had to overcome obstacles. Spiderman had to learn with great power comes great responsibility. Batman has to constantly battle with his grief and moral code. Ironman fought substance abuse and his philandering selfish nature. What was the story arch of Captain Marvel? It's just not good story telling