Write the next sentence in the following story.

How to be happy even when alone
Develop independence.
Individuals, especially extroverts (social butterflies who get their energy from being around people), may sometimes rely on others to help them feel happy or content. However, in order to be happy when we are alone we first need to become less dependent on others to make us happy, and more self-reliant.
If you are an extrovert, you may benefit from doing things alone so that you can practice developing social energy with strangers instead of close friends. Fortunately, you can continue to be extroverted and social even when alone.