Hiya, Janet!
Yes, as long as your
theme park ticket remains valid, you may cancel and book new
theme park reservations on dates valid for your ticket and that still have
reservation availability. (If you are using 1-day tickets, here is information about
dates that different 1-day tickets are valid. You may cancel and rebook park reservations as many times as needed through the period of validity of the ticket. Though, I do hope that you can unlock the magic of your theme park ticket sooner than later!
Note, a
theme park reservation may be canceled up until 11:59 PM the day before the reservation. If you are unable to make it to a reservation on the day of the reservation, you will need to wait until midnight that day for the reservation to expire before you use the same ticket to book a new reservation.
If for some reason you are unable to use a theme park ticket before it expires
and the ticket is wholly unused, it may be possible to upgrade the expired ticket to a new ticket of equal or greater value. For the most straightforward way to upgrade unused, expired tickets, visit a main entrance ticket booth. You may also reach out to a Cast Member with the
Tickets phone line or via chat in the
Disneyland mobile app to find out more information.
I hope things work out for you to visit The Happiest Place on Earth soon, Janet. Have a magical time!
~Tony