My perspective might be a bit different as someone non-binary that is not pursuing HRT at this point in my life. Over the years when I feel dysphoric and don't feel like who is in the mirror matches my perception of myself, I try to take the time to verbally complement myself or say something out loud that I have been having a hard time internally processing.
It helps me to feel like someone is being kind or helpful to me, and that even if the person in the mirror doesn't feel like who I am that they are at the minimum an ally in my journey through life.