California state assembly districts are geographically-contiguous, large, evenly populous, and generated by computer program vetted by both parties. If there's a failing, it doesn't happen in how representatives are chosen.
There's definitely a lot more to a political process than district sizing, though. For example:
- open primaries
- approval/score/ranked choice voting
- banning political ads
- ending two-party system (some of the above would help)
- effective voter education (the state pamphlet is a start...)
I know many of these sound pie-in-the-sky, but it's hard to imagine truly responsive government (ie; higher quality government than consumer services) without all or most of them.
I can't reply to the below comment, but it's worth pointing out that we also have an open primary system in California, where all the candidates of every political party are on the primary ballot and the top two vote getters advance to a runoff in the general election. Also, several of our cities do have ranked choice voting, including in the Bay Area. California's government is the result of effective democracy reform.