First, break the state into to parts, or arrange a realignment of borders with Nevada - give California Las Vegas, and take most of the northern portion to Nevada, with its access to the sea, or make California at least two separate states, one inland, the remainder the coastal counties (but what about San Diego?).
The coastal county strip could then secede from the remainder of the US, the inland state could continue to be the breadbasket for the rest of America, and the famed “bullet train to nowhere” could be used for a widening of I-5 up through the San Joaquin valley.
I suggest that we fight for Vegas. That is where the Hover Dam is located and it powers all of southern CA.
Or at least, use it as a bargaining chip. A BIG bargaining chip.