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!

Tempo tempo tempo

Use impact stickers or foot powder to establish a baseline of how you’re striking the ball. Assuming you aren’t striking it well next steps are fitting, stance, grip adjustments to strike middle of the face. From there it’s all up to you and a routine but consistent set up and swing has to be the goal.
Striking for me became better when I practiced with a deliberately slow swing.m at practice. Feel the take away, transition into the back swing, momentum pause and the a slow down swing and contact to engage feeling and body position. While not recommended for a full swing, one hand 1/4 swings to get isolation of movement. I only use a wedge for this.

Guys, you really need another set of eyes to look at your alignment, set up, contact and swing. That is why I always recommend seeing a PGA instructor. It is really hard to correct a problem without seeing what the problem is. We have five instructors where I play and five more where I buy my clubs. I support them.

With respect..

Practice with goals to accomplish.
Split the golf swing in sequences and work on sequence at one time.

If you have the funds available for lessons I would recommend that. I do think there is value in having somoene watch you and help you gain the proper feel. That being said if it isn't I would suggest using your phone to video your swing. You perception of your swing and actual swing might be completely different. Just get a visual of what you are doing and a visual you want to be at.

Watch your tempo and swaying. Film your swing, put a circle around your head, and try to keep your head within the circle (there are a handful of apps that can do it).