Extending internet signal to all outlets
What you are showing in the photo is the internet provider's &quot;modem&quot;.  In this case it appears to be a FTTH termination with 6 &quot;Ethernet&quot; outputs.
There also appears to be a single, poorly done, connection to one of these Ethernet ports that is going somewhere, presumably to the working downstairs location.
The photo doesn't appear to show any additional Ethernet wires that might be used to distribute Ethernet signals to other parts of the home.
While you might be able to do it yourself, what is needed is a new Ethernet wire from another of the &quot;LAN&quot; ports to the new location you want to have a connection to.  The simplest way would be to purchase a ready-made Ethernet cable of the suitable length and &quot;fish&quot; it through the walls in order to route it to the new location.
If that's beyond your capabilities, it might be wise to have a professional installer do this for you.  While they are at it, the existing wire should be checked and possibly replaced.