Let me try something here that may help you understand. This is kind of a simplistic explanation.I have everything already put together. All I need to know if where to file the case, what type of case to file, and the basics. I'm not asking for details or someone to do the work for me. I just need direction. Whne a Amendment in California is challenged, what is the direction of steps to be taken?
When there is case law that says that a law is either unconstitutional as applied or on its face, then its common for state legislators (if they think that the law is important) to amend the law to try to make it constitutional.
If they amend the law, then it becomes kind of a "do over" as far as case law is concerned. In order to challenge the law there has to be a case that is decided under the revised/amended law, that is appealed, and follows the appellate process in order to determine yet again, whether or not the law, as amended, is constitutional.
There is no process, independent of the above, to challenge the law. You have indicated that there was case law prior to the amendment of the law that found it unconstitutional. You have indicated that there has been no challenge to the law since it was amended. So, unless you have a case that was decided under the amended law, that you can appeal, I don't see where you can do anything at all.