This.
Watch the ball roll over your mark. Don't look at the pins until your ball passes your mark. Also, your plant foot should be pointing at your mark after your release, and your elbow, shoulders, and hips should all be pointing toward your mark. If you're having trouble keeping on target, try slowing up your approach. Take a few breaths, focus on what you're doing, then roll the ball. Also, get into a rhythm or pattern on your approach. do the same thing every time. Don't pick up the ball one time, and put your fingers in and then get to your starting point, then the next time, get to your starting point and put your fingers in. Being consistent with hitting your mark is mostly mental, and by establishing a pattern every time you go up to bowl, this helps you in that respect.
Watch the guys on tour. Every time they get up there it's the same thing. They have a pattern, and if you look at their eyes, they are all looking down during their approach. They're not looking at the pins. Their eyes stay on their mark until the ball rolls over it.
Watching the Ball roll over your mark, and making sure your balance at the line (with your shoulders/elbow/hips/plant foot all pointing at your mark) will all help you be more consistent. Like I said, watch your speed because I have a tendency to speed up my approach every once in a while and that when I start missing my mark. Keep your approach slow and that will help as well.
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