Recently I have no longer access to the internet when I turn my VPN off. The kill switch is always off, so I doubt that’s the problem. Can someone troubleshoot me ?
I instantly lose access when I turn my VPN off, and it comes back when I turn the VPN on.
Reset network and that should clear up VPN profile setting as well 
DNS. Visit 8.8.8.8 using your web browser. If it works, you need to fix your DNS settings. The IP address is for Google DNS servers so it is safe to visit.
If you set the router up to block non-VPN traffic and turn the VPN off, it will block the internet. (This is separate from the standard kill swish) You will have to turn both off in order to access the internet without the VPN.
( But need more information on your set up and what kind of VPN you are running to help more)