Hi Patricia! Thanks for dropping by planDisney.
It sounds like you're ready to enjoy more magic at Disneyland Resort, and the
SoCal resident 3-day, 1-park per day ticket offer is a fantastic way to do that! You absolutely can upgrade your 1-day
ticket to this offer, so long as your ticket is unused and unexpired at the time of your next visit. A couple of important details: the offer is valid through May 25, 2023, so you'll need to plan your visit within that window, and upgrades are only available at the Disneyland Main Entrance Ticket Booth subject to availability. You'll have to pay the difference between your current ticket and the SoCal offer and prices are subject to change.
My planning suggestion is to check
theme park reservation availability using the
Theme Park Reservation Availability Calendar. Reserve a park for the first day of your visit, and after a Cast Member has assisted with your upgrade transaction at the Ticket Booth, you can secure the additional two reservation days.
You'll be set to enjoy two additional days of fun! That should work in your favor since your visit is timed to still enjoy some of Disneyland Resort's holiday offerings like my favorite holiday attraction makeovers to
"it's a small world" in Fantasyland and
The Haunted Mansion in New Orleans Square in Disneyland Park.
I hope you enjoy your visit!
Elizabeth