Your router should have software that will have a port forwarding section. If you have not set up port forwarding on the router software itself, that is your problem.
Here’s an article on a PFSense router on how to set up the port forwarding rule. Your software may be different so just look up your router on how to do it.
https://turbofuture.com/computers/Port-Forwarding-in-pfSense-How-to-Configure-NAT