If you're interested in those topics, you'd probably enjoy reading Strong Towns (strongtowns.org), and if you're _really_ motivated you should consider becoming a member. At present, Strong Towns is the most influential group in the broader "YIMBY"-sphere, and is starting to have a real impact on the way municipal leaders operate cities.
Ultimately it's going to be a very long journey to change the culture so that we can change the laws (to permit incremental development and return to more scalable transportation patterns). Every additional supporting member makes a big impact.
(disclaimer, I'm a member)