The only way to unlock the iPad is to use the Apple ID and password that you used when you first setup the device. Creating a new Apple ID isn’t going to help.
Did you try using the old Apple ID and password?
If you forget your Apple ID or password
Your Apple ID is the account that you use to sign in to all Apple services. Usually, your Apple ID is your email address. If you forget your Apple ID, we can help you find it.
If you forget your password, you can reset it from your device or your Apple ID account page.
If you can't find your Apple ID or reset your password, you'll lose access to your account and might be unable to use or reactivate your device. To help prevent this, visit your Apple ID account page periodically to review and update your account information.