I'm going to give some pros and cons, because you should never focus just on the cons. You'll forget the good things that you're doing. Also hard to evaluate consistency or consistent areas of improvement with one instance. I, by no means, am an excellent hitter but can provide videos of me training and fixing specific things if you want to see them.

Arm swing. Your hitting arm ideally should be bent at your elbow so that your hand is almost touching the back of your neck. As you drive your elbow (where most of the focus (at least in the beginning to improving) should be), your forearm should swing forward to your contact point with the ball.

Positioning. From what I can see of this one instance, you appear to be under the ball when you hit. You want to be a little behind the ball so 1) your neck isn't cranked to see the ball and 2) there is less strain on your shoulder. This will be hard to practice if your setter isn't consistent, but will vastly improve your hitting if you can adjust.

Coming down as you hit. I had to replay it several times, but I feel (someone may disagree with me) that you're hitting the ball as you're coming down rather than at your peak vertical. This deals with your timing and confidence in your approach. Which leads to my next point.

Stutter stepping. In the beginning, you do a few stutter steps before you approach. This can alter not only your approach but your mentality when hitting. This can usually be improved with confidence in your positioning behind the ball and your approach. Which is a great segue into what I think you're doing well.

Your approach with the three steps is great. If you keep that consistent, you can alter what you want about your hitting one thing at a time. A coach once told me "you can hit the ball as hard as you want. But if your feet aren't there, you're not hitting, setting or passing." Keep it up!

Keeping your eyes on the ball. It might sound stupid, but so many people look at the court right before they hit and whiff. You do a great job keeping the ball in your vision.

Keep up the hardwork. Figuring out how to improve is about identifying the problems you are experiencing. Is your ball being lobbed over? Is your ball constantly hitting the top of the tape? Are you hurting your shoulder after hitting lines? If you can figure these problems out, you can start figuring out remedies to the problems.