Sorry to state the obvious. I don't know a great deal about this, and know you lot will educate me...
So it seems to me that Jordan Peterson (who sometimes does and sometimes doesn't have good points) has a good point on this - men and women are just attracted to different jobs. The sexes are different (as we on this board well know) and, on average, more women are attracted into (e.g.) the caring professions, and more men into (e.g.) the financial sector. So then a key element of the pay problem is that the caring professions (for example) are woefully underpaid. The sexism isn't (just) necessarily in opportunities for individuals per se, it's in the fact that sexism is so hugely ingrained that it's in all the pay structures to the core. Is this where most of the work should focus? Nursing strikes, etc.?