No clue what happened to my network adapter

I'm on a Lenovo Ideapad Gaming 3 15ARH7. From one day to the next, although it's always been finicky, the WiFi won't work. On this same wifi network in this airbnb I'm in, there are 2 mobile phones, an android tv box, a smart tv, an e-reader tablet and this Galaxy tab I'm writing on because I can't use the laptop all connected to the same network. In short, it ain't the WiFi. I tried ethernet and that isn't working either. I have physical access to the modem/router but I don't have admin access to it. How do I begin to figure out what the heck is wrong? I've never had this happen.