If you're re-pairing anyway, since changing the #Zigbee channel requires re-pairing everything, consider changing #zigbee2mqtt to use a channel that's not overlapping your 2.4GHz Wifi.
I go into more details at https://unixorn.github.io/post/zigbee-and-zwave-setup-tip/, but the TL;DR is that your best choices are using wifi channels 1 or 6 with zigbee channel 24, wifi 6 or 11 with zigbee channel 11, or wifi 1 or 11 with zigbee channel 18.