Mastering the pull up is a major milestone in many people’s CrossFit journey. It’s also a movement that is many people don’t progress into properly, and end up stagnating on improvement.
Stop using bands to modify pull ups. They are ineffective at helping people build optimal strength through a compete range of motion. While they may help you get your chin over the bar, they are unlikely to help you build the strength required to do an unassisted pull up.