I have an old laptop lying around and I have been meaning to self host some stuff on it but never got around to it.
My biggest limitation is that I only have WIFI and I do not control the network. It’s basically your default residential WIFI network.
The only thing I actually need is self-hosted cloud. What can I utilize this laptop for?
Dozens of GB sounds like there’s a lot of media files to me. I’d not share that via Syncthing. Assuming that is correct: Wouldn’t a media server like Jellyfin be a better fit? Or if it’s photos, I recommend Immich. Note that Immich is under active development and should not be your only place to store photos.