Narrow your stance so you can hinge more, you should feel a stretch in the hams/glutes, use that stretch for more power.
Active your lats by slightly internally rotating your shoulder into it's socket, this locks the bell to the torso.
Pull the rib cage down to stabilise the spine and locks the torso to the hips. Inhale on the eccentric, forcefully exhale on the concentric, press your tongue to the roof of your mouth or on the back of your teeth to block most of the exhale, this creates a tsss sound and increases internal pressure thus creating more power.
Make a tight fist with your none Swinging hand.
Be more aggressive, give every Swing everything you have, it is ok to reduce the number of swing's while learning.
Practice the hip hinge and hardstyle plank with grease the groove, the hardstyle plank is how you should feel at the top of your Swing.