I have found that the more I focus on drills to stop lateral sway on to my back leg I have improved overall ball striking. The drill I love to do is grab a basketball or soccer ball and put it on my lead hip against a wall and practice my take away. It helps me with weight shift without moving laterally keeping me in a good position to strike the ball.

The only way to improve anything in golf is to practice. Hit balls. Hit chips. Hit putts.

Practice is definitely key. Also make sure your constant with routine.

Get some corn starch and put it on the face of the club. Hit and look at where you strike the ball. Rinse and repeat. See if you to much toward the heel or toe and adjust.

Get some corn starch and put it on the face of the club. Hit and look at where you strike the ball. Rinse and repeat. See if you to much toward the heel or toe and adjust.

See a PGA teaching pro to see that your set up and tempo are correct, then practice, practice, practice.

To add to Chuck’s point, whatever you think will fix a problem won’t work because you won’t really know the actual problem

I expect my pro to find what I don’t know is wrong with my swing.

I think it's different for everyone. If you don't have the basics down though, it won't matter what you try, you'll have no consistency. Get the grip right, square the stance and the backswing is really really important. If it's off, the rest of the swing will be off. I finally took lessons after 45 yrs of DIY and my swing has completely changed! Get with a PGA coach!