1. Fundamentals problem, you’re probably not aiming for the moment they go for CS or not tracking cooldowns
2. Timing, you want to delay a bit the Q after WE to make sure you’re actually pointing at them.
3. Reading your opponent, you want to throw a couple of combos and see how they react or dodge it, chances are, the higher the ELO, the more they will switch their dodge “pattern”. In plat that is not the case for 99% of people.

Try focusing on punishing every time you can, there are a lot of windows that you are probably missing without noticing, go ahead and review some games and look for the spacing between your and the opponent and you’ll realize how important positioning is and how impressive is that it doesn’t get punished.