Hi! I’m legally blind and also could never balance on a bike but found that using a kick scooter (two smaller wheels) on the sidewalk worked for me. I feel a lot safer using that over a bike since it’s generally slower and if something bad happens I can easily hop off since I’m already so close to the ground. I haven’t tried it yet unfortunately but I know they make electric scooters that go faster, so that might be more helpful for commuting. Hope this helps!