Your shift shaft has jumped past reverse. You will have to find neutral and hold the splined shift rod in place with some needle nose vise grips until it goes into the shift shaft. It helps a lot to have a support for the lower unit like a folding metal chair.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD