I opened a link telling me my lost iPhone has been found and now I can't track my lost iPhone again, please help me

This link was a scam. Apple never sends messages like that.

If you can't find your iPhone on the Devices list, means that frauds removed it from your account. Sorry about that.

Change your Apple ID password.

No. Changing the password will secure your Apple ID.

Once the device is removed from your account, you can't track it anymore.