ex pro russian coach I know said he imagines the ball as a cube, so he can visualize what corner or face he was to rip upon.
It helped me somewhat with my slice serve, which sucked.
All the youtube vids teach to really rip past the outside of the ball, like the skimming the stone drill but vertical. I can never control that slice. The net clearance you need is just too low. And you have to aim for the perfect spot on the net to allow for the slice. It is the best feeling when it goes in. But hit it's like trying the thread a minefield of the net, the service box sideline, and the other guys forehand killing zone.
The only way I can hit a aggressive wide deuce serve is to open my grip to near eastern backhand, and swing through the ball and let the racquet face send it wide, and with some spin. It seems to go in with safer net clearance, and very wide and fast
The kick serve I can do, not easily (it is an effort ball) but reatively consistently. It is my go-to serve ad wide and deuce tee. Toss to 11 or 12. Let the ball reach its peak and then fall a tiny bit before contact. Swing hard 7 to 1. Stay sideways, don't let the shoulder come around. Drive from legs to cause aggressive racquet drop. Keep strings facing where you want the ball to go. The nice ones get up around their face, and spin away from them and disrupt their contact zone.
The rel good players, like that russian coach, get on top of it with a 2hander and just crush it
way above my pay grade.