You can change eye dominance by hurting your dominant eye. I was right eye dominant and had a terrific wreck in a stock car and the impact stretched the optic nerve in my right eye. For years I had a black hole in the center of my right eye picture. I don't know exactly when it happened but sometime over the last ten years, my left eye become dominant. I now shoot pistols with my left eye but still use my right eye for rifles. I keep saying I'm going to change to left hand guns, but, I've not done it yet. My night vision in my right eye is terrible but it only seems to effect my bow shooting in low light. My next bow, I'm going left handed.
I don't recommend doing what I did to change dominance. I also received a very bad concussion and had some damage to the brain stem. Took me awhile to learn to talk right again and that's still on going.