If you're not well-coordinated on the drums, you aren't able to play musically and smoothly execute the ideas you hear in your head. Musicality is what drumming is all about, so you need to overcome that left foot issue holding you back, free your right foot from your right hand, get your left hand able to comp and improvise freely, and get out of your own head when playing music. Be able to play smoothly and naturally, improvising ideas as they come to you. Complete limb independence is the key here - without this, you can't reach your full potential on the drums. Get started working through these lessons (and the PDF workbook bonus content) to get rolling with 4 way coordination. Enjoy!!