I definitely would suggest V poles... they’ve been super helpful to me in the past. Another idea are poles placed strategically around the fence so that you can have an idea of where you should be landing/taking off in order to take the jump straight on.
Cross pole grid work is great, especially bounces as the horse doesn't have time to think about turning.
You can also use an A frame, where you have your normal vertical or oxer, then two poles in a V shape, with the point of the V on the top pole (front pole if using an oxer). It's best to start this on with the poles a little far apart first though, so the horse doesn't panic.
A third idea is similar to the A frame, but the poles stay on the ground and the narrow part is a horse width wide.