@AndreDaGamer watching multiple videos of you, it seems like you have really high passion to improve. Keep it up.
Yes there are a lot of room for improvement. But that is a good thing, since you don't have to search too hard to improve, and it is going to be a positive step everytime.
1. I don't see the same level of intensity on the court as much as your passion for tennis. Especially on the movement, and in general like for example high intensity kids at your age WONT be walking slow to pick up the balls, they will be running.
2. You don't match your intensity of shots on your intensity of foot/movement. So it maybe a good idea to reduce the intensity of your shots for the time being, and increase the intensity of your lower body (legs). This by itself would improve your consistensy a lot, thereby allowing your practices to me a lot more effective. Effective practices make your improvement faster.
3. Don't worry too much about your shots for the time being. I think your shots are good for the time being when you take it individually. The biggest problem is you just cannot do it over and over on a match or even a practice, because there is enough randomness on the incoming ball, and without improving your intensity and footwork, there is no way to connect them together to make a successful point.
Also take rest at times and don't try to practice when you feel you are completely drained out. Also do not ever make tireness as an excuse to lower intensity or performance on court.
So in summary
Lower body intensity, general intensity on mind, footwork & consistency.
Working on those will you the maximum possible results in near future.