How to reset device without WiFi, won’t connect to Apple servers

A few things I can think to try. If cellular still functions, I would just put a working SIM in it long enough to sign out of the iCloud account.

If no cellular, or still times out that way, you can try to reset via iTunes. Just plugging in normally, not even in recovery mode will still give a restore option, although these restores do more checks than a local reset initiated by the device would, so the lack of WiFi may make the reset fail.

As for signing out of your iCloud, this can be done from iCloud.com as well. Under the Find My option, you will need to remove the device from the account. You can even initiate a reset here as well, but again it will require some internet connectivity to do so, since the device will need a way to get the reset command.

Also, just as an aside. The lack of WiFi/Blutooth is almost definitely a board problem, and likely related to the drop. The iPhone 11 logic board is two boards sandwiched together. Nearly all of the RF communications components, including the WiFi chip are on the bottom board and a hard drop often causes a disconnection between the two boards. Fixable, but not necessary if the next person using it doesn't need WiFi.