Pickleball drills to get to the next level

My friend Bill from Laguna Niguel, CA asks: "I currently play pickleball at the 4.0 to 4.5 level and want to get to 5.0. What drills would you recommend to help me get there?" Hello Bill, great job at being at the 4.5 level and striving to do more. One of my favorite drills is [...]