What I would recommend is that you try to stay behind and wait. Your whole build style is based on slowness, so try to take it slow. Engage with W-E -> Q-W -> E-W. This will guarantee that you hit someone, and with E-W, you can close a gap so that they either get rooted and die, or go across, and they get caught up. In the early game, focus on poking as much as you can, going for W-E -> Q-W. If the enemy catches on and tries to punish and juke, switch to W-E -> Q-E.