Do not just reboot your router. Go into the Quest 2 settings, turn Wi-Fi off, wait 10 seconds, and turn it back on.
This is a popular community fix that avoids a full factory reset. Connect your headset to a PC with SideQuest installed. quest 2 download stuck at 0b
Leave the headset plugged into power and allow it to sit undisturbed for 15–20 minutes. Last Resort: Factory Reset Do not just reboot your router