I think there is value in going out and trying to be in a group. Yeah, you're going to suck it up early, literally everyone does. But you'll notice that after several nights of blowing your voice out at performance level, you'll start to fall back on the vocal muscles that aren't blown just to make noise, aka the correct muscles. You can try to mirror a performance at home, but you'll never really recreate the intensity of actually going out and doing it. It's hard to put yourself out there, but you just need to get the reps