Is 5000 what you put in the Plex for the remote port?
Have you tried to disable manual port specification and let Plex try to setup the router it’s self? Most newer routers support auto configurations.
When changing routers, be sure to check that Windows still categorizes your network as a private network. It is possible that it switched you to a public network and Windows firewall is blocking access to your system.
Your Asus port forwarding looks correct, pending the port matches the config in your Plex > Settings > Remote Access page.