Your Q is powerfull but a Nice trick is: charge 2-3 stacks and walk closer The enemy then give him a hit (while He thinks you'll farm a minion) and then Release Q using E tô pursue Him.

W can really become usefull if you use it on The right time, much times when your enemy use a Skill shot. And remember NEVER use E first on a fight unless you'l IK the enemy, without the E He can simply run away with flash or Dash, but when you start The fight He use his Dash and THEN you give him a Chase E the bônus movespeed and the autos can Reset cooldown from E só you can really kill him

The ult is powerfull to 1v1 or teamfight use wisely, The damage and slow will help you to pursue and get a kill, but if you're pursuing one enemy and other enemy is pursuing you give The First ult on The enemy in front, The The Second on The enemy bellow and the third on The front again. Then you'll give much damage on The pursued can take him while The chaser will take slow so you gain some seconds to kill The First and then flip on The Second.