Using rock pi 4 without getting hot

Hello to everyone

I’m thinking of getting a Rock pi 4b.
I want to connect the device to the TV and use it as an android TV.
I have a dream to connect to geforce now and play games on television without a laptop.
What additional parts do I need to be able to use the device effectively.
I would be very happy if you could help.
I wish you a good day.