How do I become a better setter in Volleyball?

Hey, my name is Sam and I am a Setter on my team since 2023. I‘ve been playing Volleyball since mid 2022, but I‘ve got the feeling that I am not getting better. 

I play in the German „Bezirksliga“, which is the lowest league there is. During the training we are almost never doing new shit and it‘s pissing me of, but I don‘t wanna switch teams because all my friends I gained through Volleyball are there and I am probably moving in like September/Oktober 2025, so it‘s my last season playing anyway. But it‘s honestly just so frustrating because I just want to get better. 

Does anybody have any tips, maybe some exercises? I do own a Volleyball, as well as a Mikasa Setter Volleyball, but I do not have any walls to play on. I have a rebounder as well, but I have a few problems setting it up properly, so the ball just rolls onto the ground. 

Any tips would be greatly appreciated 🙏🏻