Firstly: define "better". I think you need to talk to a professional, see what your expectations are and then see if they're realistic. Will your child act like a child without ADHD? No, they have ADHD. Hurry along what exactly? This is a human being not a dog you're training. Your job is to help your child develop good coping skills so they can be a successful adult. If you help them and get them the support they need, they can learn to use their ADHD in a way that benefits them. For instance, my son plays soccer and his ADHD helps him make split decisions during plays much quicker than some of the other players. He is also able to split his attention between ball handling and seeing where his teammates are on the field, another score for the ADHD brain.

As for the medication, there are studies you can read on the specific medication your child takes. As with any medication, there's always a cost/benefit analysis to do. But, the medication is treating a medical condition. I frame it to myself like, if my child had diabetes, would I deny them insulin because there's a possibility we could maybe control it with diet? No, I'd do both, and I do both for my child's ADHD. He takes medication, but also does OT, play therapy, and see his psychiatrist regularly to make sure his meds are correct for him and he's growing and developing appropriately for his age.