How can we end potential anti-male bias in international humanitarian organizations?

For example, in resolution 1325, the United Nations Security Council UNANIMOUSLY adopted a resolution "Expressing concern that civilians, particularly women and children, make up the vast majority of those adversely affected by war." Now, to be fair, they didn't outright say women suffered more, because mathematically, the adverse effects of war on men who are soldiers could be so great that it would make it at least 50-50. But still, is it really true? Men make up the majority of civilian casualties, and while women may be victim to sexual violence more often, it still has happened a decent amount to men as well. Economically, while men do make more money & it's easier for them to get jobs in some places that are vulnerable to violent unrest, many of them still have to provide for their wife, children, or even elderly, just as women do(though in a different way).

Furthermore, the ICRC and IFRC both claim that women make up the majority of victims of "gender-based violence". I couldn't find any statistics on this, so I wonder: what is gender based violence? Obviously, it's rare for violence to ONLY be influenced by gender. So, it must mean it plays a ROLE, right? So, I imagine they are particularly referring to sexual violence. While men are less likely to experience sexual violence, it's not the only form of violence out there. What about murder, assault causing injury, etc? Are those not often gender-based? With there being many instances of times in war where the women are spared from death(though they often still experience violence, but still generally considered lesser), while the men aren't, and with men making up the majority of victims of all non-sexual violent crimes, what makes that lesser than the level of gender-based violence against women?

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These organizations are all very high-level, though, so how do we change their policies? The UN is run by member states, many of whom are democracies/federal elective republics, so activism could be done at that level. Does anyone have any ideas for that? r/equalitycompass seems good, anything else? But when it comes to non-profits, what can we do? We could contact them, spread research, or create new ones, but that could be harder. If anyone has any ideas, please comment!