Hi there! I understand you're having trouble with iTop VPN on your iPhone, and it's giving you a connection error after trying to uninstall and reinstall it multiple times. That can definitely be tricky. Let's work through this together.

1. Check Your Network Connection: Ensure that your iPhone is connected to a strong Wi-Fi or mobile network. Sometimes, a weak connection can cause issues when attempting to connect to a VPN.

2. Restart the App: Close the iTop VPN app completely and then reopen it. This can sometimes reset the connection and allow it to work properly.

3. Check for Updates: Ensure that both iTop VPN and your iOS are up to date. Go to the App Store, tap on your profile icon, and see if there are updates available for the app.

4. Reinstall iTop VPN: Since you've already tried this, let’s make sure it’s fully removed before reinstalling. Go to Settings > General > iPhone Storage, find iTop VPN, and delete it from there. After doing this, restart your iPhone for a fresh start before reinstalling the app.

5. Network Settings Reset: If the issue persists, you can reset your network settings. To do this, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Note that this will also erase saved Wi-Fi passwords.

6. VPN Configuration: After reinstalling iTop VPN, make sure to follow the setup instructions carefully. Sometimes, it’s necessary to allow specific permissions when prompted.

7. Check iTop's Server Status: Occasionally, the issue may stem from iTop VPN's servers being down. You can check their official website or support page for any updates.

If none of these steps resolve the issue, we can explore deeper settings or consider reaching out to customer support for further assistance. Would you like me to help with anything else, or are you satisfied with the guidance I provided?