If you like statistics give graphana a look. It’s a very powerful graphing toolkit, given enough time you can create really beautiful views of your data.
If you need aditional data: Many smart plugs can measure power consumption…
Before buying more sensors/actuators: Think about the communication pritocols you want to use:
WiFi
- No additional HW required
- Simple setup
- No battery powered devices or high battery consumption
Bluetooth
- Probably no add. HW req.
- Battery powered devices
- limited range
Zigbee
- good range
- lots of devices
- low power/battery powered
- needs add. HW (usb stick)
- may be a little more complex to set up
(This is just a veeery short summary)
They are out there but not in large quantities.
i.e. my new home server runs on an odroid H3