One of the things I’m planning to setup on an old pixel 3a is a hotspot with a web page basically containing some YouTube channel videos. I travel and figure someone will be bored when there is no internet access and can watch some SCUBA diving videos maybe I will get some subscribers when they are connected again.
I also use old phones and tablets as wall mounted HomeAssistant controllers.
Install something like Fotoo with Syncthing and you have a picture frame that you can have display your favorite memories. Or if you are traveling you can have new pictures upload when charging via Syncthing and someone at home can see the sights while you travel. If you setup a mount and install it on a window with an app that takes pictures on a schedule you can build a time-lapse camera and let it run forever.
Give it to a younger child as a learning tool with different learning apps. Donate it to a school somewhere with less access to technology. I donated an old laptop to a dive shop in Belize with Linux and Kiwix installed along with a copy of Wikipedia and a bunch of other learning information as well as a Python environment and the manual pages and a Rust environment with is manual pages.
Install a camera app that basically turns it into an IP camera and integrate it into your security system (great for apartments) or to monitor a pet or loved one. Or steam the video of your view from your home or work window. Add a battery bank, solar panel and waterproof everything and you have a remote camera you can put anywhere wifi works.



Got kicked out of a Catholic preschool because another boy said I couldn’t hurt him and to hit him.
Ended up at another school and was much happier, loved playing with the water table and building things. Was later told I was beyond that level and was sent home.