Voice just seems to take a long time. I've done some voice training, listen and observe, but still get misgendered frequently on the phone when people don't know me. The phone is the most challenging for me, as there aren't any visible cues to help feminize the conversation.
What I have done is to call people on service related issues when I get the chance, and see how I do without self identifying. Not so well when I'm paying attention, better once I'm chatting. Chatting, asking questions, being less direct and more participatory seem to be the hallmarks for me to audibly be recognized as a woman.
Best of luck,
Julie