Bass is more or less at his ceiling. He might be able to add a few features to his game, like a dream shake or slightly improve his rebounding, but he's about maxed out. He's a good shooting big, who plays underrated, but not elite defense, and is a middling rebounder.
He already has a faceup fadaway jumper and ability to drive to the rim when they get too close. I would like to see more that along with one more post move with his back to the rim. The aforementioned shake, or just a pump and under counter move to go with his fadaway.