Orange Pi on H5 processors. How do you solve cooling problems?

Question

ARM

Good time of the year! An Orange Pi Zero Plus 2 H5
recently flew to me (in a set version, with a USB expansion card and a black plastic case ). I made it a control station for all sorts of IoT devices in the house.

The principle is simple: when loading Armbian, the web server with Django starts, then Chromium starts and goes to http://127.0.0.1:8000). All control through the touch screen (no mouse / keyboard).

I glued an ordinary aluminum heatsink (in the size of the CPU) to the processor, which comes with 3M adhesive tape. I assembled a complete case with a USB expansion card, hooked this small box on the wall (behind the touch screen) with double-sided tape.
So, the heating of the CPU after the full load of all this goodness is 55-58 degrees! This is "screamed in red" by the built-in processor temperature sensor (in the Armbian config). After continuous work for 3 hours - you simply can’t touch the case - it feels like it’s about to melt.

Immediately turned everything off and dismantled the case. Yes, the CPU itself can leave a sickly burn on your fingers. The rest of the elements (including the USB expansion board) are also very hot ... compared to Raspberry Pi 3 with similar tasks and configurations with a plastic case and exactly the same heatsink - my CPU temperature never rose above 35-40 degrees!

Hence the questions:
1. How can you efficiently cool Orange Pi on powerful CPUs (like H5 / H6)?
2. What do you use for this yourself (links to aliexpress are very welcome)?
3. What operating temperature do you monitor at the same time?
4. To what temperature can you "warm up" the CPU of an orange?
5. The maximum allowable CPU temperature limit without power loss?
It is the use cases that are of interest, and not just "theory", so I will be glad for sensible comments and answers!
Thanks in advance.

Answer 1

(joking, with some truth)

Answer 2

I have Home Assistant inside a Docker container, polling devices, showing a web interface over WiFi (the screen is not connected).
Normal system load is less than 6%, CPU temperature is less than 35 degrees, the same passive heatsink is used.
1. plastic case + passive cooling = strange choice, you need to add a cooler
2. something consumes resources a lot, you need to change/configure the software