Headphones vs monitors for mixing

I mix entirely on headphones (DT 770 Pro) because my room is untreated. Is this holding me back? I reference on phone speakers and car but never on proper...

I mix entirely on headphones (DT 770 Pro) because my room is untreated. Is this holding me back? I reference on phone speakers and car but never on proper monitors. Should I invest in monitors + room treatment or just get better headphones?

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