I've been playing tennis since I was about 9 and once I turned 14, I stopped hitting slice serves and hit exclusively kick serves for the next 10 years. It's gotten to the point where the only natural movement for my arm is to swing up and out, and literally any other motion feels unnatural and at times as awkward as if I play with my left hand. My kick serve is reliable. It goes to around shoulder height after the bounce with a 15-30 degree kick and I can also make it a more modest topspin serve, but having only one serve (high bouncing and kicks to the right) makes it very hard for me to dictate play. I need to add the low-bouncing wide slice serve to my arsenal so I'm not just a predictable kick server. Any videos or instruction?