I am not a big expert in terms of coaching and things like that but I would say that your forehand looks fairly good as I see how you brush the ball from low to high with a natural and relaxed movement, turning the body before hitting it, using the left hand in order to balance your body. That are good routines, you only need to win consistency, reach the perfect contact point but that are things that you will improve practicing and practicing. Your backhand slice and your serve look decent as well.
What you really need to improve is your flat or top spin backhand. You need to hit the ball in a lower position, closer to your body in certain occasions, and keep the face of your racket just pointing at the wall (I saw you hitting some backhand with the face of the racket pointing to the sky).
I would recommend you to practice in the wall following these practicing drills
(and the second part is here
. From 0:45 you can see him hitting some backhand with a fair tecnique. After that part of the video he hits forehands with his left arm, that is a good practice since a two-handed backhand has to be conceived as a forehand with your left arm with the help of your right arm. If you see the whole video you will notice how active is the player with his footwork, always moving his body great going backwards (which is a tough thing to do in tennis when your opponent hits a deep shot). In the video he shows some tennis routines to practice on the wall that can be really useful for you.
Sadly this tennis subforum is not very active but I hope that somebody with a better technique knowledge comes here and helps you a little bit
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