My suggestion:
Add a (reverse) proxy in Apache and configure your web application that is connects only to the Apache proxying the GeoServer.
ProxyPass "/geoserver" "http://localhost:8080/geoserver"
ProxyPassReverse "/geoserver" "http://localhost:8080/geoserver"
This way you only need to allow HTTPS in the firewall and nobody from outside will have the chance to reach GeoServers web interface unless you enable port 8080 on the firewall. Also see https://gis.stackexchange.com/q/4323/109339 for further details.
Please note that you should set the https://docs.geoserver.org/stable/en/user/configuration/globalsettings.html#proxy-base-url of GeoServer with the public reachable URL via your Apache, e.g. https://your-apache.com/geoserver - otherwise the absolute URLs generated from GeoServer in e.g. GetCapabilities start with http://localhost:8080/geoserver (which is not reachable anymore).
If you had not already Apache in use, I would recommend nginx.