New stuff to do with my horse?

I have a 14 year old QH mare, i half lease her and there are no aavailible leases at my barn so im stuck with her. She is very quiet and good but she isn't Really good at anything. She jumps a little, i team pen with her but she is not a cow horse, she trail rides but she isnt REALLY good at any of those, i just need some new ideas on her. i feel like she is too easy and there is no challenge. I'm a very advanced rider and i have ridden very difficult horses and im just bord with a easy horse