I prepared for a huge pickleball tournament with 600 entrants by taking lessons from three coaches. Let’s briefly talk about two of my coaches.
One coach taught drills to improve consistency of each type of shot. Long before the tournament he taught a couple skills. If a skill used (and strengthened) the trapezius muscles, then he taught serratus anterior exercises to balance the muscles and prevent injury. Near the tournament he taught that you have the skills you need, relax and let your opponents make mistakes (hit the ball into the net or beyond the backline).
A different coach was all-knowing and he tinkered with my grip, my swing,… Maybe the tinkering improved a specific shot, but at the cost of worsening overall consistency.