The biggest gains to be had are obviously systemic, and what I do as a consumer is far more limited in its scope and impact. I still limit my flights, no longer attend in-person conferences, try to travel more local, because what else am I going to do? I'm aware this is like putting out a cigarette when the whole town's already on fire, but I can't deal with the dissonance otherwise. It's still an individual luxury that can have an oversized impact compared to everything else I do.
Advocating for it is not going to be sufficient at all, but it's still the most impact I can have when all the big stakeholders who have to fix their powergrid are not even in countries I live in.