Port forwarding with a public IP address /32

Hello community,

I have a problem with my configuration.
My provider gives me the Public IP address 102.216.38.2/32 and there is a DMZ configuration on this address. My WAN port is 192.168.0.200/24 and my Local network is 192.168.111.0/24. When I ping from the external network (outside my LAN) to my Public IP, it goes through without a problem, but when I try to access my router from this address, it doesn’t go through. What port forwarding or other configuration can I do? I’d like not only to reach the router from the external network via 102.216.38.2, but also to retrieve information on SNMP traffic.
Looking forward to hearing from you.