I would say the one key element to stay focused is to not put too much pressure upon yourself. I think it is normal that people want to have amazing results but we should all take care of our physical and mental health!
If you do manage to make a game (which is totally fine when you don't - afterall gamejams are great because you don't need to) you could also try to think of how cool it is to have a project that you made in 48h that you can showcase in your portfolio! :D