If you want to make a difference, making comments (about ongoing projects, particularly) will tend to have more impact. For something more systemic (like light cycles deprioritizing pedestrians), I found the best solution was to move to a better city.
If that's not a solution for you :) then another option you might want to consider is having a meeting with your municipal (or even higher) level elected representative - invite them for a walkthrough of a more problematic space, and try to explain the issues and possible solutions as calmly/rationally as possible. And without attacking car culture directly, as that tends to get people defensive.
I don't know if this would translate well to other cities — SF has a very pedestrian-friendly layout with narrow, slow streets , small blocks, and short light cycles — but it works well enough here that it might be worth trying elsewhere.
Instead of squares, their streets intersect in diamonds, where the (largely one-way) streets come out of the corners. They're a bit larger than a square intersection-- it's like you took the square, and then filled in four right triangles at each of the corners.
The main effect is that crosswalks are significantly pushed back from the intersection center. As a pedestrian, there's far less ambiguity about where the cars are going (regardless of whether they use their signal). Same for drivers: you never have to wonder which way a pedestrian is gong to cross when they're standing at a corner where two crosswalks meet, because there are no such corners.
Of course, this also makes intersections much bigger. This is offset by having parking spaces along the edges of intersections.
But let me tell you, it can be infuriating if you're walking to actually get somewhere. The city I live in has been replacing 2-way and 4-way stops with roundabouts, which has a similar effect of moving the crosswalks away from the intersection. Now it takes much longer to walk anywhere because you keep having to detour out of your way to cross the street.
TL;DR is that "we" won't prioritize any road user except the automobile.
[1] https://ops.fhwa.dot.gov/publications/fhwahop08024/chapter4....
I'm not very good at nor patient for trying to do neighborhood people organization and go around in circles with City Hall for 5 years (as has been the case with other neighborhood things like park use etc. that I have previously been involved in). But I am tried of losing about 5-6 hours a year to excess wait times at intersections despite trying to avoid the slowest crossings.