Also, one thing that I think is a good indicator that your solutions are the right ones is when you can argue for the same solution from wildly different value systems. Ending car dependency? I can just as easily argue that from a free-market libertarian perspective as from a socialist perspective. Whereas to be in favor of car dependency, there really is no way to argue for that under either value system without being wildly ideologically inconsistent.
Plus, as you say, actually arguing for these solutions using the language and value systems of our traditional opponents can do a lot to reach people who are on the fence. And it’s not even dishonest to do so because I genuinely believe ending car dependency is the more pro-freedom stance. It’s just about knowing your audience and putting things in the terms they’ll understand best.