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Hi!
If you merely want to improve your top scores I would recommend simply replaying your levels. That way you can "skip" levels you have already passed with flying colors.
If you would like to reset the whole game if you reinstall the game app and do not connect it to the same Facebook / Kingdom account you should be able to start from the beginning again. Please note that your saved lives and boosters tend to disappear in the process.
I hope this helped!
Jenny - King Care Team