Wrist strength only comes into major play if you have a jump shot like Lebron for example, if you look at this shot it's basically a simple flick of the wrist really. My guess would be since he's always been very strong he never really needed to learn how to shoot a proper jumpshot where you incorporate everything that
Tiger mentioned like properly bending your knees to generate upward force and pushing the ball up with your arms to add upwards power before the release point.
so yea unless you gotta Lebron jumper, you don't need to work on your wrist strength, focus more on proper foot work and generating power with your arms during the point of raising the ball from your groin height to above shoulder height right around release point, because by that point all your wrist is really supposed to do is aim and fling the ball and give it proper spin, you're not supposed to use your wrist to literally PUSH the ball to give it distance, your arms and body moving upwards do that.
I'll tell you one thing though it ain't easy, changing my jump shot took me a few years, I used to fling it from the left side of my head (I'm right handed) so it looked pretty ugly. This was because In high school I was an athletic slasher and finisher around the basket, never really got into jump shooting since dunking was the coolest thing to do when you were younger... but now that I'm older and a few ankle injuries later slowing me way down I had to learn how to properly shoot, and the only adjustments are made were simple but they had a huge effect on my consistency. So yea the tips I would give you for a better jumper than turned me from a horrible shooter to a smooth operator from mid and long range would be.
Most important ones are listed first
1) Never shoot unless your feet are comfortably set in place and you can generate proper lift at the right angle (you'll be amazed how much this improves your shooting percentage)
2) Find the right amount of lift in your jump that gives you the most consistent result, meaning you don't have to jump super high when you shoot just to look pretty, for example my midrange jumpshot I jump fairly high I need too because defenders are in my face, and release high, it looks fckin sweet like an NBA guard but less accurate, but for my 3 pointers since I have a lot more air space to shoot I need more control so I jump half as much in the air and this gives me much better accuracy
For your issue with the ball coming off awkwardly from your hands, I suspect you have Kobe syndrome, (tiny hands) lol, Kobe is 6'6 but has the hands of a 6 footer.
For that a simple fix where repetition is key, I used to do this a few hours a week for weeks at a time, but it worked.
Lay flat on your back and get one of those small kid sized basketballs, the mini ones and just work on your arm motions shooting the ball straight up to a marked point at the ceiling, repetition of this will help your arm motions and since this exercise involves your wrists heavily because you are literally flicking the ball up it will really help out your release point wrist issues with your jumper, and the reason I'm telling you to use a small ball is because it's harder to do this with a smaller ball and it really makes your fingers do a lot of work, then once you get the hang of it with the small ball give it a shot with a normal sized basketball see how it feels.
Here's my jumper at work BTW, take a close look at how I generate lift for the ball to give it distance so by the time it gets to the release point I just use my wrist to guide the ball and give it spin. In the first video look at the 55 second mark the free throw jumper, you can really see it all work in unison, how I shuffle my feet together to give me the perfect stance before I jump and just a nice smooth upward motion, the wrist is doing very little work.. bahaha I just realized looking at these vids again in the second video, at the 46 second mark I literally stole the ball from my own teammate
