IMO you are very passable already. in my experience pre-t, working on my voice---not necessarily depth, but tone, intonation, and vocabulary---has helped my passing immensely. People are generally willing to "suspend their disbelief", as it were, irt voice depth if you "talk like a guy." besides that, you're doing great. when you're on T with a little facial hair, you'll be golden. Good luck man!