Also related UUID displayed instead of username
I don't want my name to be stuck like this until August 13th.
A moderator can change your name under exigent circumstances.
Given that your name seems to have been changed to a random string by accident, you would seem to have good reason to get a reset. A list of moderators for our Stack Exchange can be found here. You have sufficient reputation to contact them in chat, or you can wait for them to respond to this question.