XIAO nRF52840 bluetooth antenna

I understand that the XIAO nRF52840 has a bluetooth antenna, but I am still looking for ways to improve its range. either ArduinoBLE (library tweaks) or hardware based.

can someone stir me to the right direction, please and thank you…

Also, is 5.5V its max voltage in?

Hi, I don’t think there are additional places for additional bluetooth antenna for wider range, nor the software way. Sorry.
Also, the 5V and 3.3V will be the best input voltage. Otherwise the board might be damaged.
Hope this can help you!