Hi Caro! First off great job, and really cool discovery into the belay! Sometimes accidents create magic as you did here!
1) make sure you cross the poles before diving through the center (your poles don’t look crossed in your video), that’s key to make sure one leg doesn’t slip down low once you get into the split.
2) Be sure to turn the correct direction (If your right leg is the standing leg, you will turn towards your left) when diving through the poles to prep for the arabesque lean out.
3) After the slack drop, you were correct pulling up into the arabesque, from there just lean back a little so you can unhook your right leg from the right pole and bring it down next to your left leg.. then bring your upper body forwards (through the middle of the poles). Then just fold to your left thigh hitch/hip key from there.