I already had braces, never got into the habit of wearing a retainer so now my teeth shifted and I'm having a hard time. (Photo)

My teeth used to be crooked. I had to get braces around the 7th grade. I got them off 11th grade. Even with straight teeth, I still hated my teeth and the way they looked. I gave up on it. I couldn't get into the habit of wearing the retainer. My teeth shifted. It's not as bad as it was prior braces, but it's bad. I've managed to get my teeth to shift back enough to slip past the check-ups I have with my orthodonist, but I'm tired. I would hate to wear braces again. Is there any option for me?