The thrill of the win drew you into games of chance. This might have been a lucrative sideline that paled in comparison to the real risks of adventuring, or you might have fallen on hard times due to your gambling and pursued adventuring as a way out of a spiral.
Choose two ability boosts. One must be to Dexterity or Charisma, and one is a free ability boost.
Source: Pathfinder Core Rulebook (Second Edition)