All of the techniques you mentioned—an attitude adjustment, taking risks, and breaking rules—can be valuable for removing mental blocks. Each technique addresses different aspects of creative thinking and problem-solving.
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Attitude Adjustment: A positive mindset can help alleviate fear of failure and increase openness to new ideas.
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Taking Risks: Stepping out of your comfort zone can stimulate creativity and lead to unexpected insights.
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Breaking Rules: Challenging established norms can inspire innovative thinking and allow for new approaches.
Ultimately, the effectiveness of each technique may vary from person to person and situation to situation. So, it's reasonable to say that all of the techniques can be equally important, depending on the context.