Maybe you don’t know if you’re an extrovert or introvert. If that’s the case, an excellent challenge today would be to take a Myers Briggs or other personality assessment. The official Myers Briggs assessment is not free, but it is worth the cash for the insights you can gain.
But if you know you’re an extrovert, today’s challenge is to learn something by yourself today, through listening rather than hands on interaction. Listen to a TED talk.
For my introverted readers, take your brain out on a date! Engage one or two people in an intellectual conversation, at work or at home.