Airport Extreme turned into a brick

Not sure how much time that you want to spend on an AirPort Extreme that likely has experienced a power supply hardware problem.

Temporarily, connect an Ethernet cable from your Mac to one of the three LAN Ethernet ports on the AirPort Extreme. If your Mac does not have an Ethernet port, you will need a USB-C to Ethernet adapter.'

Open AirPort Utility

If the AirPort Extreme appears, click on the picture of the AirPort and a small window will appear with info about the AirPort Extreme

Click on the amber dot next to Status to see what error message the AirPort is reporting and post back with that information.

The AirPort Extreme needs a new power supply board, but as I mentioned above.......if you want to continue to use an AirPort as your router......frankly, it is out of date security wise.....it would be far less expensive to look for a used product on Ebay.

The problem is that none of my devices have Ethernet ports.

That is why I mentioned that you might need an adapter.

Unfortunately, Apple will not service the AirPort Extreme even if you are willing to pay.

An independent shop might be able to find a new power supply board....(Apple does not sell this part).....but frankly if you want to stay with the AirPort, it would likely be significantly less expensive to look for a used AirPort Extreme on Ebay.

Even if the shop can find a power supply board, I imagine that labor would be a minimum of $150-175 for repairs. The AirPort was not really designed to be serviced.