Tips on Cooling down your home router?

I have an Asus Gigabit router AX6000. It is about a year old and has had no problems until I moved into an attic apartment with poor ventilation, cooling, and a heat wave. The internal temps are reporting around 170F.

This is after I have moved it to get better airflow. Any ideas on how I can keep it colder? I am experiencing very slow network speeds presumably due to the temperature. I have ruled out the modem being the issue.

Right now my best idea is to remove the cover and see if I can either attach a heat sink and a fan to the CPU or just remove the cover and have a fan blow air over it.

Any better ideas? Other than not to move here or fix global warming?