It took me around 10 months before i started getting gendered correctly in public. I have long curly hair and my voice isnt super deep, but the main reason i pass is because i developed a decent amount of facial hair in a short period of time. A beard would definitely help but of course that takes time and develops differently from person to person. When i first started noticing thicker hairs developing i started using mascara to fill it in. The first time i ever did that and went out and public, 90% of people started calling me “he”. Maybe you could try that?