SOME (very few) drawing tablets have a "reset" feature.
Check your user manual or contact support to see if your tablet has this feature
Wacom has a reset procedure for their Intuos Pro tablets that may resolve Bluetooth issues, as well as other unusual problems that users may encounter.
The step-by-step instructions can be found on the following support page: https://support.wacom.com/hc/en-us/articles/1500006273501-Why-is-my-tablet-not-pairing-over-Bluetooth-or-not-showing-up-under-Bluetooth-settings-when-in-pairing-mode.
Here is a snippet:
Directly to the right of the power button is a small pin hole which contains a reset button. To reset the Wacom Intuos Pro:
Use the reverse side of the Pro Pen 2’s Nib to reset the tablet Insert the reversed Nib straight into the hole and press firmly feeling the reset button depress
Hold for 10-15 seconds until the power light on the tablet turns off then release
Once released the tablet will turn back on, and the memory on the tablet is now reset to default.
Apparently some Huion pen displays have a reset feature. I've never tried it so I don't know how well this works.