Hey Hamza, this is great it’s good to see what’s going on here and we can give you feedback. So I think overall your technique and movement of the shot is nice and you don’t seem to be too tense which is a common problem when lifting heavy backspin. So I would say the main thing for you to focus on is preparing quickly after the serve and getting down low in the legs early so you can pause before hitting the ball and have more time to prepare yourself for the shot. Also your body position is very important, try to make sure you are keeping your weight forward and not leaning backwards.
Using the knees to get down low and push up into the shot will really help lift the backspin, almost try to think of the shot in 2 parts so you bend the knees, pause for a second and then accelerate up into the ball, this pause is really helpful for lifting heavy backspin. I hope this helps and let me know if you have any other questions.
Dan 🙂