I think a simple rational answer is "peers and mentors". In the fields dominated by man a-holes having other women as mentors and peers is the only path to change. Women teachers and other female musicians.
Set absolute boundary to mysoginy and subtle sexism. Reach out to feminist groups, festivals and organisations. Have feminist men as allies- unfortunately their word can be taken more seriously when you need to convince male colegue about his mysoginy and why it is harmful.
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