I'm not sure what reality you live in, but I had decided long before I told anyone at work and they still kept misgendering and deadnaming me regularly without me magically getting them fired. The only solution really is to switch jobs and never tell them your prior name.
The only exception to this is very obvious malice. Everything else is more likely to get you fired if you complain to HR than them.
The only exception to this is very obvious malice. Everything else is more likely to get you fired if you complain to HR than them.