Hi there! I’d be glad to help you with the issue of not being able to open your Fifth Third Bank app. To start, could you tell me a bit more about what happens when you try to open the app? For example, does it crash, freeze, show an error, or does nothing happen at all? Also, are you using the app on a mobile device or are you trying to access something on your Windows 10 computer?

Knowing this will help me guide you through the best solution. Meanwhile, here are a few general steps you can try to fix the app not opening on a mobile device:

1. Restart your device: Sometimes, simply restarting your phone or tablet can clear up temporary glitches.
2. Check your internet connection: Make sure you have a stable Wi-Fi or cellular data connection.
3. Update the app: Go to the app store (Google Play for Android or Apple App Store for iOS) and check if there’s an update available for the Fifth Third Bank app.
4. Clear app cache (Android only): If you are on Android, go to Settings > Apps > Fifth Third Bank app > Storage > Clear Cache to remove temporary files that might be causing issues.
5. Reinstall the app: Uninstall the app and then reinstall it fresh from the app store.
6. Check device compatibility: Sometimes updates to the app mean it no longer works on older devices or OS versions, so check if your device and OS are still supported.

Depending on your answers, I can offer more specific instructions or troubleshoot further. Let me know!