Have you just been doing bounces? Or have you been incorporating the bounces in with one and two strides? Like maybe a bounce to a one to a two. Or you could even do a bounce to a one to a bounce (just make sure you set the last bounce right). You can also set up 3 one strides in a row and then 4 strides to an oxer. These are just a few thoughts. Gymnastics are so fun and so good for both rider and horse!
Today I did a very challenging gymnastic line in my lesson, it was bounce, bounce, bounce, one stide to an oxer, one stride verticle, bounce, bounce. It was very hard and challenging bc your horse has to come back to you for the last two bounces... just a thought