I’m optimistic about the future of Lemmy and the 3rd party apps, I’ll give Thunder another go if the dev follows through! I saw that Sync is planning to release a Lemmy app which I’d be keen to try, was my main Reddit app for a long time before I switched to Infinity.
Currently just use it for backing up KeePass and uni files across two laptops and a phone.
I think it would be fun to use it for storing DRM free games (like from GOG) and sharing them with friends. Create a big dump of games and share them with each other. Maybe even share save files in games where that’s common.