Here's the problem, I think: There's no escaping what you know (or what you think you know). So adding more is much simpler than changing how or why. To do so you must fundamentally break from your most basic assumptions.
My suggestion is read more broadly on a daily basis and let the ideas percolate into consciousness rather than as an strained product of it. Once there gradually shape them on their own path. I also find that talking to a broader sample of friends and family and even strangers on the bus forces you to re-evaluate those basic assumptions. Groupthink affects us all but it's really a symptom of who we associate with (and why) than it is of how we think.
My suggestion is read more broadly on a daily basis and let the ideas percolate into consciousness rather than as an strained product of it. Once there gradually shape them on their own path. I also find that talking to a broader sample of friends and family and even strangers on the bus forces you to re-evaluate those basic assumptions. Groupthink affects us all but it's really a symptom of who we associate with (and why) than it is of how we think.