NAT type ps4 only strict?

I have already tried everything that can be found on the network, i.e. Enable ports, activate DMZ and switch off the firewall of the router. But I still have a strict NAT type, someone can help me here. I prefer not to call my provider or the service hotline.

But it would be interesting how you get IPv4.

If you do not have your own IPv4 address, you can't activate a port)

The ps itself has an IP which I also used for DMZ

Nene. I mean the router. It's about public IPv4

Connect LAN cable. Which line do you have? Where is the router or modem for Wi-Fi.

I'm not sure of the public, since we have a new router I hardly know anything about the settings