Thread:Fishin Chip/@comment-22439-20151231180209/@comment-27474902-20160109231731

If you uninstall the game and then reinstall it again, then play without logging into Game Center you will be starting from scratch. But if you log into Game Center it will ask if you want to sync your game. If you say yes it will overwrite your progress with the one stored online.

But perhaps you could try uninstalling and reinstalling and then syncing with Game Center first. This will keep your progress but refresh the copy of WWR on your device but keep your progress. Have you tried this yet?