Uh... What..? Black Widow isn't relative, inspiring, or meaningful. She's a triple-crossing spy, who falls over herself in servitude of organizations that she thinks will help "wipe her ledger", while doing nothing special in the stories she's represented in.
Again, a character should generate hype for everything outside of their gender. Lack of representation for women, really? Scarlet Witch, Gamora, Nebula, Mantis, Okoye, Shuri, The Ancient One, Pepper (from Day 1), upcoming Captain Marvel?
Black Widow does not need a solo film. The MCU doesn't need an origin story for a character introduced a decade ago.