Peter wrote to tell the faithful to be fruitful in growth in their faith. He also alerted them that he was soon to die (...shortly I must put off my tent), and asked they remember him after his death. Finally, he confirmed the prophetic word that they should heed as a "light that shines in a dark place". (Quotes from NKJV)
Speed up the return of Christ - 1) Share your Faith; 2) Prayer; 3) Be holy in our conduct.