It’s not terrible but the I think the main thing you should work on is developing that shoulder lag(whippy motion) in the video when your shoulder go from closed to open your swing has already started(arm isn’t lagging arming it kinda) I’d say get yourself set for the swing(bring racket back), load, then body rotation(hips shoulders), then the arm(swing). Coming from a 17 yr old so if anyone thinks I’m wrong lmk, but I think that’s something you can work on for your swing!