Hey there Melinda,
Welcome to planDisney and thank you for stopping by with your question! I'm happy to see that you have a trip to the Disneyland Resort coming up very soon!
From my experience, there is a lot of Disney Magic that can be worked to upgrade tickets to a new option that is of equal or greater value. For the
Southern California Resident Ticket Offer in particular, I'd recommend confirming that the terms and conditions all apply to your situation (if you haven't already).
Particularly, the section that states that this offer is valid "for California residents within ZIP codes 90000-96199; proof of eligible residency, including valid government-issued photo ID, is required for both purchase and admission."
Assuming that all looks good then you'll want to next
reach out to a Cast Member at the Tickets line. They'll be able to look at the specific details of your current ticket and let you know if there would be any options to upgrade it to the So Cal ticket offer.
This will be a really fun time to visit the parks because of all the fun that's happening including the Disney California Adventure Park 25th Anniversary, which just kicked off a few days ago! You can check out this
Disney Parks Blog entry to get all the details but I'm most excited about the return of Soarin' Over California and that awesome Pixar Pal-A-Round popcorn bucket!
Thanks again for your question, Melinda. I hope you have a wonderful time on your next trip to the Happiest Place on Earth.
Have a Magical Day,
Greg