Hi, I am an Independent Advisor, and welcome to Microsoft Q&A.
I understand your Bluetooth is gone.
Have you tried performing a hard reset?
Please follow the steps below.
Turn off the laptop.
Holding down the power button will cause the screen to shut off.
The power adapter should be unplugged.
Take the laptop's charger out.
If the battery is detachable, remove it.
To remove the battery, turn the laptop over and slide the battery release switch.
(If your battery is integrated, skip this step.)
Hold down the power button for 15 to 30 seconds.
Any residual electrical charge is drained in this way.
Reattach the charger and battery.
Restart the laptop.
Please check if the Bluetooth has been restored.