You could switch out the Pi 0 W's with ESP32's or Raspberry Pico W's (if you'd like to stay in the Raspberry ecosystem). They're a lot cheaper, require less power, have a smaller footprint, aren't too hard to set up and there's usually a library ready for every sensor.
I have a pi4 running OSMC with the Plex addon attached to my television.
I've got about a half dozen Pi 0 W's with addon sensors that inform my Home Assistant of the temp, humidity, PM2.5 level, and CO2 levels in each room.
I just ordered a CM4 to run the PiKVM board for my homelab server.
I also plan to monitor and water my plants using Pi 0 W's.
I just ordered a Pi4 for running BirdNet, to identify birds in my area.
I would also like to work with ChatGPT to identify people and/or birds around my house.