Hi Maryam, welcome to planDisney!
Thanks for bringing your question to us, I can help!
The great thing is that Guests can update their
theme park reservations themselves from within their
Disneyland Resort account! You will first need to cancel your current theme park reservation by logging in to your Disneyland Resort account, and selecting the "My Disneyland" link. Then you will need to click the "Ticket and Reservation Details” link, select the reservation you wish to cancel, and click "Cancel Reservation". You'll then be able to select the party members who need to cancel. Once canceled, you're free to go ahead and book your new reservation! You can do this by going back to the "Ticket and Reservation Details" link, and selecting "Mark Park Reservations".
BUT, before you cancel your current reservation, I recommend looking at the
Theme Park Reservation Availability Calendar to ensure
Disneyland Park has availability. I actually just looked, and good news, I see availability on November 16, 2022, for standard 1 park per day tickets.
If you need any more help, please visit us again!
See ya real soon!
Jin