I can only impact directly on my own family, my own organisation and on those where I sit as a non-executive board member.
Dh and I have always tried to split things equally. We shared responsibility for the childcare when dc was little and we shared all of the domestic stuff. I feel like we provided a good model of an equal partnership for our dd.
In my organisation, we have done a huge amount of work around DEI, from training and awareness campaigns to staff forums to mentoring schemes etc. And despite requiring some office attendance, we have given staff a lot more flexibility about working patterns and how they approach their roles. It's a work in progress, but I have definitely seen a shift in the culture over time. More men (including those in my senior leadership team) have come forward to request flexible working arrangements, either to care for their children or for their elderly parents. More women - including women with young children - have been promoted to senior roles etc.
I make no secret of the fact that I also have caring responsibilities and that I sometimes have to work flexibly around these - no longer for my dd because she is grown up now, but for my elderly parents and another elderly relative. I think it's important to model the fact that you can still be in a senior role while carrying out those responsibilities and it makes it much easier for junior staff to ask for adjustments if needed.
As a Board member, I have less direct influence, but I can ask questions about DEI issues and how they are being addressed. I can make sure it stays on the radar of senior managers etc.
In my community, I mentor a teenage girl from a challenging background. I feel like I can at least offer her a model of a woman who has worked hard and successfully combined career and family etc.
So no magic wands but plenty of small incremental gains. What else can you do other than keep chipping away?