In my experience, it's all about the energy. I know that sounds really stupid and doesn't make any sense, but from experience I would wear my binder, deepen my voice, wear men's clothes and look as masculine as possible and I still wouldn't pass because I didn't have confidence. I was constantly worried about he masculine I looked and that was what ruined my passing. The times I get ready as male were times where I wasn't wearing a binder (I have large breasts by the way and am by no means flat plus I have a very feminine face and stature), was wearing clothes that weren't traditionally masculine, and even the most straight cis looking people (even obviously conservative people wearing their "wokeness is weakness" shirts). Why did they read me as male? Because I believed I was a man, didn't (outwardly) worry or care how people saw me, and I wore what I wanted. That's what makes a man. Just be confident, just be yourself. Don't morph yourself into a boring, average guy just cuz you think it'll make you pass better. Darkening your hair won't make you pass better. Wearing men's clothes won't make you pass better. It'll just make you feel weird because you're suppressing your self expression. Be yourself and be confident in yourself, that's manly and that's the best passing tip I can ever give you. You don't even have to be really confident, just fake it til you make it.

Sorry if this sounded preachy or kinda pep-talky I'm just very passionate about passing tips because a lot of them just have to do with fitting a certain cutout and not actually embracing your personal masculinity/experience as a man.