Learn to shoot with both eyes open.
If you're right handed and right eyed, you can still shoot left handed and right eyed. I've been shooting right handed and left eyed for years now.
I dont have to close an eye unless I'm shooting a longarm right handed (I normally shoot them southpaw). And I dont have to do that as often now, I'm getting to where I can target with my right eye and leave the left one open, I just cant do it consistently.