Invisalign didn't work after 3 years 3 months. What are my options? (photos)

My orthodontist has finally told me after 39 months that my teeth won't move any further and he can't fix my cross its. He is offering me no options except to slant my bottom teeth inward to fit under my top teeth. I started this but hated the way it looks. Now he has asked me to sign a form that says I am quitting orthodontic treatment before I have achieved my desired rests and releasing him from responsibility. My teeth don't fit. He says regular braces won't work either.