Does the repeater absolutely have to be where you currently have it for range extension? If not, you might want to instead consider what would be useful to your home automation while also serving as a repeater.
For example, I’m quite pleased with Sonoff’s new presence sensors. I use zigbee2mqtt, but I believe someone else has them working with the Zigbee binding. If you’ve had any thoughts about presence detection, then this could be a good opportunity to try it out while also extending your network.
For outlets, I’m quite happy with Third Reality’s outlets, but not sure if Third Reality sticks to the Zigbee standard.