As you are able to more easily stretch in this pose, practice with lowering the height of the block under your forward hand, until eventually your right fingertips rest on the floor.
Or, instead of using a block, you may bend your right elbow and place the forearm on your right thigh, palm up, energetically pressing out through the right fingertips. Lift the ribcage up away from the right thigh to create additional space in the left side as you stretch.
Regardless of which variation you are practicing, as you hold the pose, gently draw your lower rib cage forward and lift your gaze (if your neck allows) to further open the chest.
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