One year into adult brachial plexus injury

M22 had a dirt bike accident on may 17th, 2024. My spine was injured in multiple places ( Right c1 lateral mass fracture, and left c4, c5, c6 and c7 fractures along with a lot of the thoracic.) which has healed well enough but I also had a brachial plexus injury on my non dominant left arm. It has been a little over a year now and I’m losing hope and confidence in the handling of this situation, I have dexterity in my hand and progress has been hopeful there with 50lbs of grip strength coming back along with wrist mobility and even some forearm but no ability to rotate without leverage. As far as the arm and elbow/bicep go there has been almost no improvement in the ability to lift or bend it ( I can move it in the pool). Around the time the accident happened I didn’t get paired up with a consistent nuero who had any experience with this and I was just so grateful to be alive that I didn’t think too awful much of it and they did order a mri and ct scan which they said looked like it was a “stretched nerve” and explained it like insulated wire and it would grow back over time with pt. The thing that scares me more as I look into things is that a Emg or nerve test was never done on me and I’m beginning to wonder if a surgery of some kind would help bring my mobility back or what realistically would be the best path moving forward