Do you have port 80 and 443 forwarded from your router? Do you have nginx or similar set up to handle those requests? Those are the next steps.
Forward 80 and 443 to your device's local IP and use nginx to specify what domain requests to to what service.
Example:
Overseerr hosted on 192.168.1.44:5055. Nginx server receives a request from overseerr.examplesite.com. Nginx forwards that request to 192.168.1.44:5055.