I was looking for ideas. My home base is Florida but I now reside in CA. Seems like there is no active, organized effort in CA like in FL and other states.
I would encourage you to support the national organizations, particularly those that are successfully pushing court cases.
I don't see much that can be done to help in Kalifornia. A massive riot in the big cities which demonstrates the fallacy of relying on government for protection might help. But I doubt that you can arrange that.
A truly bankrupt Kalifornia might help. We will know that the situation is really dire when the legislature decides that it cannot afford to maintain the state's gun registry. But, unfortunately, I think the liberals would rather dispense with fire-fighters or sewage treatment first.