I can think of two other things that you can do with a raspberry pi. If they aren't what you want then I don't know anything else.Check it out and its just people wanting retro gaming. Which, unfortunately, is not really my cup of tea. What else can I do? I found a reddit thread but its all projects of making an amp board etc etc.
I need a conversation with someone about this lol.....
1. A mediacenter. Use this to watch movies, tv series, animes or adult oriented stuff . You need a NAS drive for this if you don't have one already or connect a USB harddrive. You will be using Kodi to watch anything you want. You can also install addons that streams content from many different services, most of them are illegal though. IE, I have an addon where i can watch Hong Kong dramas
2. NAS drive. I haven't tried it myself, but you can create a NAS drive with raspberry pi. But you need external drives that has own power source. The power from the raspberry pi is not enough for external harddrives