I personally use mine very boring.. simple FLIRC case and ethernet cable chugged in and it hosts my personal website & discord bots...
A project I still want to do some day is hook up a camera to my Raspberry, hang it near the front door and experiment with facial recognition.
Tbh there is plenty of projects/fun experiments you can do with a Raspberry.
From small moving robots to recognition system and domotics.
For some inspiration I would refer you to these websites personally, as they give a lot of projects that you can derive from or reproduce yourself: ( https://www.ubuntupit.com/20-best-ra...art-right-now/ + https://pimylifeup.com/category/projects/ + https://www.tomshardware.com/feature...ry-pi-projects )