"Act more extraverted" 

One study on "acting like an extravert" found that introverts did not succeed in increasing their extraverted behavior as much as other participants.

• Introverts did not benefit in retrospect from acting like an extravert.
• They did not show momentary gains in authenticity.
• Their retrospective fatigue levels seemed to increase with the "act extraverted" intervention.
• Their experience of negative emotions increased.