Use the usb port to add internal storage if you can and remove the tiny flash sata.
Add a fan bolted to the outside of the case, cut a large hole for it to maximise airflow and add a grill on top of the fan. Use the sata power port for the fan.
Or keep the sata, externalise a fan and use power from the internal usb port. You'll need a donor usb cord you can butcher for the plug...a slim charger cord for a phone etc will do and should be easy to find in trash.