Stop Tweezing
Tweezing has got to be the biggest culprit of accidentally too-thin brows. You try convincing yourself you'll just pluck the few stray hairs that contribute nothing to your actual brow shape, and twenty minutes later your brows aren't even sisters anymore - they're second cousins. STOP. PLUCKING. We get it, the temptation is real, but if you keep giving into it you'll have no brows at all, and we can't have that.
[Photo via @alluremakeup.fr]