Your target is an individual choice, and there is no single rule for every bowler.
Some bowlers always targeted at the foul line, and others far down the lane.
What ever target you use draw an imaginary line down the lane, from the dots to
the pocket, and attempting to throw the ball along this line. Keeping your eyes on
your target until the ball crosses it is that keeps your body down during the release
so you don’t pull up prematurely.