My Front Teeth Shifted/slanted After Orthodontics, and I Have Worn my Retainer Nightly. Help? (photo)

I am 20 years old now, and I would like to not have to get braces again. Is there anything else I can do to fix this problem? I have been pretty consistent in doing everything my dentist told me to do after getting my braces off (2 years ago), but they have slanted anyway and people tend to stare at my teeth when they talk to me now. It's not fun.

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