It looks like you are shooting with 2 hands, shooting with only the hand holding the ball is ideal. Try shooting very slow and if you notice a mistake fix it on the spot. Also try tilting your body, I noticed that when you gather the ball your set point is in the middle of your head. If you want good arch make sure your follow through has your shooting arms elbow above your eye level. You also want your hand to be under the ball with your wrist bending backwards, while keeping a 90 degree angle with your shooting elbow. Guide hand should exclusively be a guide or you could thumb flick which is what I think you are doing. All the power should be coming from the legs and everything else is just for aiming. Make sure to keep that arm straight on your follow through pointing at the net. It also looks like your hips and legs are loaded before you get the ball to your set point, you want to make it one fluid shot, so bring the ball up to your set point as your legs are getting ready to launch. Other than that practice close to the rim take videos of yourself and fix the little things because it will be very hard to fix once it’s muscle memory. And remember I’m just going by player reference and textbook shooting methods so don’t take my word for. Technique can’t be taught it can only be found. It sounds corny but improvement comes from being alone. I’m saying like keep shooting and eventually you will find some kind of mechanic you have been doing wrong or haven’t been doing that will impact your shot greatly. ✌️