If I factory reset my kindle and I played Castle Clash when I download it back on again would my account still be there?

If you factory reset your Kindle and then reinstall Castle Clash, your game account should still be accessible as long as it is linked to a cloud service or account, such as google Play or Facebook. However, if your progress is solely saved on the device itself and not backed up, it will be lost after the reset. To ensure you retain your game data, check the game's settings for account linking options before resetting your device.