I currently have my router/ONT set up in my basement. I also have ethernet wired throughout the house connected to the router. I want to put the router in one of the rooms upstairs to have better coverage throughout the house.

I can connect one of the ethernet wires and move the router to the appropriate room and the router works perfectly fine. However, the ONT only has one ethernet port so I can't connect any of the other wires. Is there a way I can split the port on my ONT so that I can connect the other wires or does it have to go through the router?

Any advice on what the best way to set up the router upstairs while still being able to connect the ethernet wires would be greatly appreciated.