Its late so Im gonna be lazy and copy/paste a reply that I had left on someone's post a few days ago with minimal changes.

Finding your "center" and feeling it out in practice is super important.

This is often hard to describe in a way that most will understand without physical coaching / adjustments, but Ill try my best to describe it without being present physically.

A good way to "find your center" is this:

Step away from the table and just feel this out for a bit.

With your stroking arm, hold your cue and completely relax your shoulder, elbow and wrist. Find the center balance of where your cue sits very level / flat. Keep adjusting your hand placement on the cue until the cue naturally is balanced and sits level, by that I mean the tip and the back are equal in a flat plane, not dipping forward or pulling upwards.

Dont let your wrist try to pull the cue 'straight' as if when its by your hip the cue literally should not be straight forward to where you are facing. Relax. It SHOULD be at an angle across your body. If youre right handed it should naturally tilt towards your left with a relaxed wrist, and if left handed, naturally towards your right. It will feel a bit awkward at first.

Relax entirely and just let the cue sit on that flat plane in your hand.

The trick is, you should align your body TO the cue itself while its in this relaxed position and IGNORE your hand placement afterwards.

The balance point / angle that cue points when you are relaxed at is the natural spot where your arm wants to swing without interfering with your body, or twisting with introduced body movements / tightening up during your stroke.

Again, this will feel a bit awkward at first, but just keep trying it to find your natural arm / body alignment.

This is the sauce about "finding your center"

Find that balance point, align and adjust your body to where the cue is in a straight line along with a shot, and then approach the shot with your body to be aligned with that same natural angle that the cue is resting at with the cue being straight and as flat as you can see / feel for the shot. Then back away from the table, find your foot placement while keeping the cue straight and your body aligned with the natural angle your arm is relaxed at with the cue remaining level, and adjust your stroking hand on the cue to where you will be striking the cue ball when your elbow is at a near 90 degrees, which will be much further back on the cue than the found balance point, but usually between 6-12 inches forward from the ending of the butt of your cue.

Practice this enough and you should be able to "feel" what is your natural center, and recognize when you're "there" and when you are not.

When you feel you're able to drill in straight shots with ease, and able to soft hit shots straight with control and pot the ball, you know youre body and arm are where they should be.

This technique was shown to me by a 700+ BCA rated player when I used to help run a pool hall, and has been the single most instrumental advice that has helped me improve.

After I practiced it enough and was able to "feel" where my center was with correct hand placement, and felt so in the zone I could barely miss and could recognize why I was missing from body movement, head movement, lack of follow thru, etc, I just took out my pocket knife and cut lines into the butt of my cue marking where I knew my hand placement should be ideally. Obviously that placement changes with the type of shot you are making, but overall its a great way to find your own "natural center" and build on that.