You can compare your strokes single frame and one above the other in this post using a laptop. To single frame on Youtube, stop video and use the
period & comma keys. To select a video place cursor on video and use the
alt key + the left mouse click. Otherwise, the video starts playing when you select it. You can go full screen and come back down and the video stays on the same frame. Start at impacts on both videos and move back and forth comparing racket positions in most similar positions. For most accurate comparisons, find very similar camera angles (find better videos). (It's easiest to find a model for a stroke with videos and then record your stroke from the same camera angles.) I'm just posting the videos one above the other to do this and following the instructions above. You can find what you consider model strokes and find better videos and make your own comparisons. List all differences that you see.
Your video recording rate is OK for ground strokes in the above video. 240 fps is very good for the serve. Some smart phones have high speed video. ?
The first difference I see on your forehand is that
maybe your upper arm tilts down at too much of an angle. ? That slows down the racket head speed by making the radius out from your uppermost body smaller. The rotation axes are the spine neck area & later also the shoulder joint. I don't have statistics on what is being done in the WTA regarding that upper arm angle, but check some WTA forehands and see if you find your upper arm angle being used. Halep & Swiatek have their upper arms extend out farther than you do.
Another difference is that you have racket face open at contact. ATP impacts are consistently closed at impact.
Search: tennisspeed blog Djokovic forehand
Look well down in this long article for pictures of racket face angle at impact.
tennisspeedresearch.blogspot.com
Djokovic racket face closed.
Federer racket face closed.
I have not studied the two hand backhand very much. You might compare yours to players in a compilation of WTA backhands. (I did not find a compilation.)
Your serve toss is high and that affects the time between toss release and impact.
On the serve, your arm looks too upright at impact compared to the ATP players that I've looked at. ? At impact, ATP players have their body and arm tilted more forward than you. On the other hand, Karolina Pliskova, a top lady server, is very upright too. ? Also, I looked at many ATP players and the majority were not looking at the ball at impact, they break off just before impact. Some are looking at impact. I believe that looking at the ball impact limits how your neck and head can move. But watching impact is an option.
Stosur seems to have her head on its side, at least for her strong kick serves.
You have good strokes. What is your background?