"How do i make a good audition?"
Don't focus on the horses you own in game.
Include the services you are looking for (to be a trainer, judge, lessons, boarding, ect).
Your riding experience. (if you ride irl or not (if you do ride irl, including vids of you riding is a bonus!)
If you play on PC or mobile.
How active you are/your timezone.
Extras/Why we should choose you instead of others.