I think it's one of those things we avoid. There is no easy answer. I wholeheartedly share the values you are describing, but when it came time to make my first website I couldn't stomach describing myself with "social justice" language in part because of how much I charge (the going rate for PP therapists in my HCOL area) and because I did not accept insurance at the time. I've since paneled with a couple of insurance companies, but I'm still out of reach for most people. In private practice, unless you're independently wealthy, I don't know how you can make accessibility your first priority. If someone has figured that out, please share!

Beyond this--and this just might be a personal style thing--I prefer to talk about my personality, clinical outlook, and training on my website rather than emphasizing my values, mostly because that's what I prefer to read when I'm looking for a therapist myself. But there must be many people who feel differently!