If you're experiencing issues with not being able to click on messages and nothing loading on your iPhone, despite having a good Wi-Fi connection, follow these steps to troubleshoot the problem:

1. Restart Your iPhone
This simple step can often resolve temporary glitches. To restart your iPhone, press and hold the power button along with the volume button until you see the slider appear. Slide to turn off the device, wait a few seconds, then turn it back on.

2. Check for App Updates
Go to the App Store, tap on your profile icon in the top right corner, and scroll down to see if there are updates available for your messaging app. If updates are available, tap "Update" next to the app.

3. Clear App Cache (if applicable)
Depending on the app you are using (like Google Messages or Facebook Messenger), it may be beneficial to clear the application's cache. Although iOS does not have a straightforward method for clearing cache, deleting and reinstalling the app can serve a similar purpose.

4. Reset Network Settings
This will clear all stored Wi-Fi networks and their passwords and reset cellular settings. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. You will need to reconnect to your Wi-Fi after completing this step.

5. Ensure Background App Refresh is Enabled
Go to Settings > General > Background App Refresh and ensure it is turned on for your messaging app. This allows the app to refresh its content in the background when connected to Wi-Fi.

6. Check Wi-Fi Connection
Even though you mentioned your Wi-Fi is fine, it’s good to confirm. Go to Settings > Wi-Fi, and find your network. Tap on the "i" next to your network and choose "Forget This Network". Reconnect to the Wi-Fi by entering the password.

7. Inspect iOS Settings
Make sure that your iOS is up-to-date. Go to Settings > General > Software Update to check if there is any available update.

8. Disable VPN or Proxy (if any)
Sometimes VPNs or proxy settings can interfere with app connectivity. If you have any VPN or proxy settings enabled, try turning them off.

9. Check for App Restrictions
Go to Settings > Screen Time > Content & Privacy Restrictions and ensure there are no restrictions set for the messaging app.

10. Reinstall the App
If none of the steps above work, uninstall the messaging app by pressing and holding the app icon until it wiggles, then tap the "X". Afterwards, reinstall the app from the App Store.

If you've followed these steps and the issue persists, it might be helpful to reach out to the app support or visit related discussions for additional help with specific apps - learn more - learn more - learn more.