What to do with a Raspberry Pi 4?

When Raspberry Pi 5 pre-order was announced, I considered getting one to replace the Raspberry Pi 4 (RPi4), one of the servers in my home network. At that time, I also discovered a couple of Intel-based Mac Minis up for sale, and I couldn’t resist, even justifying that it blows the new Raspberry Pi 5 (RPi5) out of the water in all aspects, except perhaps power consumption. The RPi4 lived another day or months, for that matter (I have yet to reboot it with an uptime of 84 days as of this writing). And the Intel Mac Mini? I upgraded it to 16GB and instead of being the home server, it is now one of…