I had braces before. My teeth shifted, so I got Invisalign, but it didn't fix my midline

I had braces when I was a teenager. When my braces were done, it wasn't fully centered. My bottom teeth has shifted so I got invisalign to fix it and the midline. I have one more tray to go but my midline still isn't fixed. My dentist says my teeth needs to shift by 2mm, there's no space since I've removed my teeth previously for braces, might need to shave some down. I'd have to go back to braces to get the midline. Would another set of invisalign fix it? Or would I need to go back to braces?

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