Getting frustrated with my setup: Conbee 2 (deCONZ) > zigbee > Aqara motion sensors

Configuration Zigbee
2

Chances are, you either still don’t have enough routers or else your motion sensors are still connected directly to the coordinator.

Have a read here Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking.

Also, Aqara sensors are known to be quite obstinate and don’t change routes by themselves. Try to unpair them from the coordinator and pair them via the closest Ikea plug manually.
You can do this in ZHA by going to the device page for your Ikea plug > 3 dots menu > Add devices under this device.