Having just had my first appointment for HRT, I can tell you that I did not start right off the bat with a GAHT provider - I started with my regular old general practitioner, who - by my research and switching to her - was already very LGBTQ+ friendly.
And then something unexpected happened: it turns out my GP studied under Dr. Jerrica Kirkley, one of the founders of Plume.
If you have the ability to throw a $99 charge on your card, your health savings account, etc, I would absolutely recommend at least an initial consultation through Plume. You can always get another opinion/option later.
Another upvote or seven for fastmail.com - I spent a little too much time spinning my personal domain hosting through Fastmail, Tutanota, Proton, mailbox.org… and then came back full circle to Fastmail.
Their shortcomings, if you’re concerned about privacy, are listed right above^^^ but I don’t think you can find a better email hosting provider for the pricing.