Hi! If you saved your game locally, your cache might have been reset. Unfortunately, if you don’t have a backup, you’ll have to create a new save. I recommend making text saves as a backup to store in your notes app in case your computer’s cache is reset.
Viewing post in Warrior Cats: Hickory Isles comments
On the save menu where the save files are, press 'Copy a text code'. Then copy & paste the code on to some kind of notes app. (And then when you want to load the save later, copy the code from wherever you put it and press 'Paste a text code' on the load menu, where you'll be able to paste the code in and continue playing).