on the backhand, maybe try to shorten the take back, or take it back earlier. Also to use a ohbh with topspin is fairly difficult and requires a good amount of prep and conditions. Generally, you should be using the slice for higher / lower balls. Pretty much anything out of ideal hitting area should be a slice as it is much easier to hit. Otherwise, convert to a two hander. Thats what Ive been doing recently, and I can drive more shots a lot better.
on the forehand, looks like your issue is that your arm is lagging behind too much. Ideally, it should be rotating as your body is, or slightly behind, but your hand is far too behind. Youre opening up your body too fast, when your arm lags behind your body like that, you have no strength or control of your hitting arm. Contact is in front of you, with your body facing the ball. Your left hand, though is up and pointing to your right, just drops when you hit. Make sure, you are getting that coil from pulling your left arm to your right, as well as, using that coil and pulling your left arm back to your left side, rather than dropping it.
Also maybe try and close your stance a little more, it looks very open right now, so maybe aim for a semi open?
not sure if this is valuable info, but good luck.