"I've read posts berating & criticising women for not doing enough for men, and posts discussing some 'men's issues'. I've not read a single one suggesting how men could help women or address women's issues."
Firstly, I haven't seen any berating or criticising of women 'for not doing enough for men'.
Secondly, I don't think it's women's 'work' to inform men how to help the cause of feminism, just as I'm sure we wouldn't appreciate men telling us how we should be supporting them.
I think women should think about how we can support female causes, AND possible ways in which women supporting men might also support women's interests.
I also think men can advocate for specifically make causes (eg raise awareness of prostrate cancer, or suicidality), AND think about the ways in which men supporting women might also be in their own interests.
If we ALL 'do the work', we all benefit. You (Arabella) seem to think that we can or should only think about one kind of problem at a time. I'm suggesting it may be more efficient to take a more holistic approach.