Wifi works but Ethernet doesn't?

Hi, im new to IT type things but ive been working on some home lab stuff recently. I had a nas connected to my internet and made it my primary DNS so I could run Pihole through everything. Well it got disconnected and for some reason it stopped working. Fine, okay, ill fix that later. However the problem became that the wifi wouldn't work. It existed but anything connected to the wifi wouldn't have internet. I ended up resetting the router and that fixed my issue. However now the problem im running into is anything that was connected to my router through Ethernet cannot connect to the internet. The Ethernet cables light up, my computer recognizes the ethernet is there, but like the wifi i get no internet.

Now the thing is the two issues may be unrelated. The Ethernet was working while my nas was disconnected. It was working all the way up until my dad disconnected the internet box. The box we get our fibre internet. He Unplugged it and plugged it back in. He maintained ethernet connection for a little while after he unpluuged the box but after some time the Ethernet just stopped. The delay throws me off a bit, because I would think it would happen more immediately if it was gonna happen. So im not super sure whats going on or what to do. Any advise?