I still don't have an open NAT type after enabling UPNP

Hello,

I'm having infrequent issues when I'm gaming like random packet loss and disconnects and decided to investigate my NAT type, which apparently is a Port Restricted Cone NAT type, and I thought that might be the source of some of my problems so I decided to change it to be open. Everything I've looked up online seemed to indicate that making sure UPNP was enabled (which should've already been enabled but for some reason it turns off by itself randomly), making sure I don't have a CGNAT or a Double NAT, and a few other small things means I should have an open NAT, and yet I don't. Is there anything I'm missing here? Do I need a new modem perhaps? I'm on an XB8 and thought about upgrading soon for this reason.