For your player Pi’s, you can use our write protection plugin.
Further, you can add shutdown commands for all devices as http-requests (shown in the voice control beta plugin) to safely shut down any systems you want to remove from their power supply.
This should add a lot of longevity to your SD cards. We have devices running here for multiple years, nearly without any interruption.
Another important factor is the speed and quality of the card itself. We recommend using nothing below Class 10.