How can sexism in WW be faced?

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Green Lantern, Flash and Manhunter are portrayed as more capable than WW when it comes to power compared to Superman. That to me is not a coincidence.

If you say so. Just because you say it is, doesn't make it true. Diana's current power levels have nothing to do with sexism

DC already replaced her with harly queen. Who gets more push than WW ever did.

You're right about them pushing Harley, but they still aren't able to put her on the Justice League as a superhero, and she is still inherently tied to the Batman franchise. If they succeed in turning Harley Quinn into a full on superhero with good sales then I have no doubt that Wonder Woman will become just like any other character and be cancelled once her sales drop, only to be brought back two years later.