Port forwarding,enabling DMZ and enabling UPnP still get me a strict NAT (Type 3). I can't connect and keep disconnecting from GTA V and Rainbow six Siege

btw,when portforwarding, lets say I wanna portforward port 6015, local port from 6015 to 6015, and remote port from 6015 to 6015 right? The interface should be Connection_1? Still getting a strict NAT after I have done this. No matter what I do, NAT always strict one.