Put ur hands farther apart and hold them down and gently pull the right rein then the left and keep on doing that intell they go on the bit then soften.
They cannot work properly in a bit less bridle
I don't ride bitless, but I do know that when you are asking your horse to collect, you want to use LOTS of leg and then gently squeeze each rein. Don't saw your hands back and forth. When your horse accepts this, let go a bit so he knows the reward. This may take lots of practice, but really make sure you push him into the bridle with leg. Use seat according to how your horse responds. Also be sure to listen to your horse and makes changes and experiment:) hopes this helps😁