I found that Anki is quite a good box. You fill it with flashcards of stuff you want to learn and tickles the same part of the brain a fees of social media nonsensde would
Definitely needed this one today. This has been me lately: https://www.youtube.com/watch?v=Pe-zq4bFPFU. I think pre-prepared boxes are a super helpful idea to save yourself from the absurd (but I think common?) that if you can't do well in an open-ended box at the moment, you're doomed to a bad box. "I don't feel creative or energetic to work on my novel, so I guess I'll just go on social media for God knows how long" doesn't have to be the dichotomy.