congratz CC on having the courage to post your serve and make yourself vulnerable to the community. i think you have a wonderful service toss and the toss, if not the most important, is certainly one of the most critical functions of the serve. so you are already more than half way there.
take it from me, someone who is also working diligently on service motion, you definitely want to work on one thing at a time. as you make the desired changes to your service motion to discover desired results, i suggest you slow down your motion in order to encourage muscle memory instead of pace. pace will come naturally as your technique improves and is not something to even think about.
with that said, one modification i made to my serve which lead to immediate returns on investment was pronation. presently your racquet, just before you swing to hit the ball, is held like a waiter holding a tray. holding the racquet this way diminishes greatly your ability to generate pace on the ball. what you want to do is swing up at the ball with the edge of the racquet just as if the racquet was an axe and the ball was a branch of a tree that you are trying to bury that axe into. start off hitting the ball while in midair with the edge of the racquet until you become comfortable with the stroke. you don't have to swing hard or anything, just nice gently axe swings to the ball after you toss it.
once you become comfortable swinging up to the ball with the edge of the racquet, just before hitting the ball with the edge, snap the racquet head open such that the strings of the racquet his flush with the ball. this motion is called pronation and is crucial in maintaining power and control during your serve. once you learn pronation, you will be able to learn flat, kicking and sliding serves as the dynamic introduced to the ball revolves around the the technique of pronation.
here is a video of me working on very slow deliberate pronation technique. tune in at the 1min mark. everything before 1 min is getting the rust off and trying to slow down. i will be the first to admit that i am no where near a great server however i think my video is a good example of how amateurs should go about slowing things down and working on a specific aspect of their motion. give feedback if you would an let me know if it was helpful at all.