A. Clear the app's cache by going to your iPhone's Settings > General > iPhone Storage. Find PewDiePie's Tuber Simulator, tap on it, and select 'Offload App'. This will free up storage without deleting your data. Then, reinstall the app from the App Store.

B. Make sure your iOS is up to date. Go to Settings > General > Software Update and install any available updates. Sometimes, app crashes can be resolved by ensuring compatibility with the latest iOS version.