Home automation. I always had an Alexa and a couple of WiFi switches, but I just discovered the rabbit hole of Home Assistant, Zigbee devices, flashing devices to get rid of cloud capabilities and install your own firmware, and the whole ordeal. Haven't had this fun with tech in a while.
A few years ago, I got really into orchestrating LED accent lighting in my small studio apartment without going the Phillips route. With a few Alexa commands and some switches, I had multiple configurations that turned on when I woke up and again when I came home (using various cheap sensors). It was a blast!
