Once you legally change your name, I suggest you start informing the world about it as soon as possible. I changed my name nearly five years ago, and I moved to another state 18 months ago. I still get mail addressed to my deadname, sometimes from companies I have never done business with (even AARP). Email is just as bad, and I suggest setting up a new email address as soon as possible. I still check the email address I created under my deadname in case something important shows up, but I ignore just about everything which comes in on that address.
Other than responding to everyone with your new name (financial institutions, schools, utilities, stores, government entities, etc.) and submitting a 'change of address' with the postal service, what steps have you taken to 'kill' your deadname?
Love always -- Jessica Rose