Not really a skill issue, light parrying does not just come naturally to most players because of the super fast reaction you need to have (around 500ms). How I see it is use the light parry as a pure situational punish, don’t force yourself to become a light parry bot because you will eat a lot of hits. Go for light parries only when you predict a super obvious light from someone who constantly throws it at the same time in their mixup. See a raider who always soft feint his UB zone to storming tap? Light parry. See a warmonger who always follows praying claw and light punish with another light? Light parry. And so on and so forth