I've spent a lot of my childhood isolated with not much to do, and the best periods where when there was something that I could do that didn't involve spacing out or reading the same books over and over again. Like when there was a guitar or a piano available and I was able to start learning on my own.
Learning helps creativity. So does doing low-attention sorts of things. For example, going on a quiet walk or cleaning house. And seriously, going on a walk is a good habit for kids to have. Anything that might make a kid curious is also something that helps with creativity.
Additionally, an adult simply asking curiosity-invoking questions aloud helps develop those sorts of thoughts. Same thing for explaining why you do whatever hobby you do. If you don't have an offline hobby, start one just to be the good example.
> Of course, it’s not really the boredom itself that’s important; it’s what we do with it. When you reach your breaking point, boredom teaches you to respond constructively, to make something happen for yourself. But unless we are faced with a steady diet of stultifying boredom, we never learn how.
Tl;dr parents can encourage/punish their kids and let them think for themselves. This is healthy and good.
Also, to loop back to the larger discussion, using screens definitely doesn't discourage bullying behavior. For evidence I present . . . the internet, give or take.
(Speaking from experience -- it was scary, but he recovered.)
Doing the wrong thing can be corrected. Worry about actions, not thoughts.