I have half a dozen of these - they seem to work very well.
https://www.amazon.com/Design-Zigbee-Extender-Amplifier-Repeater/dp/B0CK9PRZ4T/
Edit: There are some other options here:
I have half a dozen of these - they seem to work very well.
https://www.amazon.com/Design-Zigbee-Extender-Amplifier-Repeater/dp/B0CK9PRZ4T/
Edit: There are some other options here: