Writing more female protagonists would be great, along with female-all-the-other-roles!

This, so much. I'm not going to say that there aren't problems with how women are portrayed in fiction, but in general, I'm (mostly) okay with the variety of female characters that exist. I'm just not as pleased with how limited their "career opportunities" tend to be or how often those opportunities mean supporting a male character instead of getting their own stories.

Or in other words, the female characters don't need so much improvement as much as people just need to make better use of them.