Port 8333 closed, fwd on Router OK, firewall port open, full-node not reachable
First, check your router opens that port too and redirects that port to you computer.

Then check CGNAT. If the external IP address your router shows isn't the same as you find when you search for "what is my ip", your ISP is giving the same IP to multiple customers. So you won't be able to open a port.