The bowler’s stance affects the entire approach. Alignment, ball position, and foot placement all impact aspects of the delivery of the ball. One simple element of the start position can also have a big impact on ball speed.
If you are looking to slow down your ball speed, it helps to lean back in the approach, centering your weight more on your heels. This can slow down your overall rhythm and reduce your ball speed to create more hook without making any other changes.
Starting with the weight more on your toes or leaning forward slightly as you get started will create more forward momentum and increase your ball speed. This is especially useful to bowlers with smaller builds who are trying to get more speed on the ball.