i always draw in pen lately (shown here, though these suck lol due to being drawn without any care and my pen dying)
unsure if it's helpful or not. i do think it forces you to think about contours more and forces you to accept mistakes but you need to not get as accepting of your mistakes as me lol
also with ink pens use multiple, one of my biggest issues is because I only have thin ones atm I can't really utilize line weight