This may sound stupid. But it works. At PG events you’re better off rearing back and firing fastballs off the backstop at 90 than throwing strikes in the mid 80’s.
We had a third baseman on our high school team with the yips. He went through a streak when he had trouble lobbing the ball from second the first (bounced a few). I told him when he gets out on the left side in a showcase just fire the ball at the first baseman. If it goes into the front row, so what. He showed off his arm. Colleges coaches weren’t scared away by the overthrows. They saw a gun they could fix.