Welcome to NT. Sorry to hear of your injury.

You are still very early in your recovery. A lot of spontaneous recovery may be coming. The Lumosity claims are very misleading. There is a huge difference between recovering skills and functions lost due to injury and building weak and under-developed skills that have just been dormant.

You may over-task your brain when it needs gentle rehab.

As mentioned, you need protein with a diverse combination of essential fatty acids. It is near impossible to get the full array on a vegan diet. There are some seaweed sources and such that try to make up for the meat based EFA's. They have their own limitations and complications.

Please do not get your hopes too high for a quick recovery just because you are starting neuro-rehab and therapy. Your brain has its own schedule for recovery. The best doctors and therapists can not over-rule your brain's timing.

Take it slow, try to keep your stress levels low and let your brain heal.

My best to you.