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Hello @ari_ophelia unfortunately there probably isn't a way to recover your lost boosters. Your boosters are stored on your device, and by deleting the app you deleted the memory.
You can try contacting Support to see if they are feeling generous, but they generally only replace purchased items.
Here is a link to the official article for your issue.
Here is a link to King Support just in case you would like to see if they will offer you any goodwill.
Hello and welcome
I'm sorry, but uninstalling it could lose boosters and lives. It's also all in the help center. You can find this under Gear - Question Mark. If you bought the boosters, I could help you further. Since they are probably free, it is unfortunately not possible. Because you always get new boosters.
Hope that answered your question !!
Have a nice day