I'm actually using an old Android I had laying around and collecting dust (Huawei P20 Lite), battery was pretty much flopping, but as a Linux user tried to give it a second life and made a sort-of Android TV box of it.
I installed a TV launcher and 2 main apps (SmartTubeNext and Cloudstream), then connected it to my main Linux laptop through cable and run a program called scrcpy which let's me duplicate the image/audio to a separate window in my laptop. Cheap and dirty, but it works flawlessly.
Another use you can give it is an offline, turn by turn navigation gps. OsmAnd is an excellent app that provides you with offline navigation. Install something else, like a modded Youtube Music/Spotify app or even AntennaPod if you're into podcasts and you pretty much have a cheap, budget Android Auto unit. Sure, it will not be the best of all, but it's pretty much free at that point, and it will get the job done.