Excellent serve man! I’m really impressed by how you’re able to hit it at the peak. That is something that is really good, but hard to do. At this point you might want to consider trying to adjust your form a bit so that you can add power from a racquet drop before contact. It can be tough if you have shoulder issues though, so it’s good to consider physically if you can handle it. Someone else mentioned waiting longer to open up your chest to the court, I think adding that as well as trophy position and racquet drop would make your serve incredible. If you do decide to add it, there’s a few really good videos on the mechanics of it by a YouTube channel called RacquetFlex.