If you are unable to log in or sign up for Google, TikTok, or Facebook, follow these steps to resolve the issue:

1. Check Internet Connection: Ensure that your device is connected to a stable internet connection. You can toggle airplane mode on and off, or switch between Wi-Fi and mobile data to test connectivity.

2. Clear App Cache and Data:
- Go to your device's Settings.
- Select Apps or Applications.
- Find and tap on Google, TikTok, or Facebook respectively.
- Tap on Storage and choose Clear Cache and Clear Data. This may help in resolving access issues.

3. Update Apps:
- Open the Google Play Store on your device.
- Search for Google, TikTok, and Facebook.
- If updates are available, tap Update for each app.

4. Reset Passwords:
- For each service (Google, TikTok, Facebook), attempt to reset your password using the "Forgot Password?" feature. Follow the instructions sent to your recovery email or phone number.

5. Check for Account Lockouts or Suspensions:
- Sometimes accounts can be locked or suspended for suspicious activity. For TikTok and Facebook, visit their help centers:
- Fix a Login Problem | Facebook Help Center - [learn more]
- For TikTok issues, refer to this guide: Unable to Log In to Your TikTok Account? Try These Methods - [learn more]

6. Reinstall the Apps:
- If the above steps do not resolve the issue, uninstall the affected apps and then reinstall them from the Google Play Store.

7. Try Different Sign-In Method:
- For TikTok, if you normally log in with Facebook, try using an alternative method such as logging in with a phone number or email. This can sometimes bypass issues caused by third-party connections.

8. Look for Notifications or Specific Errors:
- If you see specific error messages while attempting to log in, make note of them. Searching these specific errors in forums or support pages can yield different solutions tailored to that problem.

9. Contact Customer Support:
- If you continue experiencing issues, contacting the customer support of the respective app might be necessary as they can provide targeted assistance.

10. Enable Required Permissions:
- Ensure that the apps have the necessary permissions enabled. Go to your app settings and allow permissions related to storage, location, etc., for optimal functionality.

By following these steps, you should be able to troubleshoot and resolve the issues preventing you from logging into Google, TikTok, or Facebook.