There are various strategies that can be used to challenge stigma, but they're not all equally effective. Patrick Corrigan's book The Stigma Effect shares what the research has to say that can help us to be more effective advocates.
To find out more: https://mentalhealthathome.org/2019/01/10/stigma-effect/
Sharing our stories is an important way to put a human face to mental illness. The post Ways to share your mental health story has links to a wide variety of sites where you can tell your story.
These are just a few of the organizations that are working to challenge stigma.