Not sure what the availability is like at your age, but maybe join some skills camps? A nutritionist and trainer both sound like good ideas. I think paying a person is a waste of money if you can afford a ball return net(Amazon link: https://www.amazon.com/iC3-by-Airborne-Athletics-Basketball/dp/B00AXM2PJO). This way you can shoot around whenever you have spare time, instead of relying on the schedule of someone else. I wouldn't go crazy with the skill accessories if I were you tbh, just get shots up in your free time and practice whenever you can.
Not a seller or coach anymore but this product helped a ton with fixing the guide hand rotating for some of my past players.
If you want to get your elbow straight then you need to fix your elbow and that's about it lol. As a starting point, go back to the old drill of laying on the ground holding the ball, in only your shooting hand, straight out in front of your face. Work on bringing the ball up and down, like you would if you were shooting but focus on making sure your arm comes down to the floor with your elbow tight to your ribs. Once the motion starts getting comfortable, start actually shooting the ball up as straight as you can - while doing that you want to make sure the ball is going straight up and down so it's easier to catch with one hand again, but mainly because it will help you know that your release is straight. Focus on snapping that arm straight up and controlling it back down next to your ribs every rep to start developing that muscle memory. Then of course continue putting up foul shots while focusing on keeping that elbow tight to your ribs.
They make products like this for cheap that can help but if you're going to use it, don't cheat the system and start twisting your body so that your elbow can still stick out.
Shooting Aid
Once you've fixed your elbow position, you may need to adjust your release to make sure it's pointed more at the rim. It's ok now because you've figured out your shot, but once you straighten your elbow you might find that your shot tends to fade to the right
Shooting machines like The Gun or Dr. Dish are sizable investments. I don't know what your definition of expensive is, but if you go on their sites, they ask you to call for pricing, and that's a good indicator of how expensive this stuff can get. A similar machine on Amazon was priced at 5000 dollars, and I don't know how much cheaper it can get from there.
You can get something like this for about 600 dollars. Or one of those "ball catch" attachments for a basket will only be about 50 bucks.
I think just making a friend will be so much cheaper, more effective, and in the long run, more fulfilling than any of those options, though.
I use these with my players. Well worth the price.
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https://www.amazon.ca/Spalding-TF-Trainer-28-5-Weighted-Trainer/dp/B001XOSQBM/ref=pd_sbs_200_2/159-3400340-1315221?_encoding=UTF8&psc=1&refRID=KRZ7JRF4B2XFNTT57GR8 This is close to what you are looking for.
I brought this off Amazon after my Freshman year of HS when the varisty coached told me my two handed jumpshot was holding me back. Practiced with it for a couple of weaks and it completely fixed my flunky guide hand.
That's the only thing that worked for me. And I tried a bunch of shit before that too. Squeezing my thumb to the side of my hand, crossing my index finger behind my other fingers, etc.
These are good when you make it, but I highly recommend the slightly more expensive version with a net: http://www.amazon.com/SKLZ-Rapid-Fire-Return-180-Degree/dp/B00N0NGU44
It is strongly made for any weather and does a great job helping you get reps and returns most of your misses.
I saw on Woot.com for $75, so keep an eye out on discount sites if you are strapped for cash.