I love doing gymnastics! And it helps your horse jump better!
Gymnastics! Bounces and broken lines, clovers, or maybe try going for unconventional course work with different obstacles/maneuvers between fences.
You could probably even try free jumping or train him/her to follow you over jumps on the ground for treats!
XC, bounces, different combinations
Try incorporating some raised small poles into your jumping to break it up for her a little
How about putting up some cross country jumps? That’s always a fun activity