Stay the same: Explosiveness
Tyler Herro is not going to blow past his defender and get to the rim. He does not have a lightning-quick first step and struggles to create space off the dribble. It leads to some head-scratching turnovers and too many mid-range jumpers, but Herro is not an elite athlete.
It impacts his defense too. The 6’5 guard cannot stay in front of the ball and is an easy target whenever matched against a similar-sized player. Improving his foot speed and lateral quickness is impossible. He could make small gains, but not enough to be impactful. Herro will never be even an average on-ball defender, which limits his upside.
Even if he is not more explosive, he can still make gains on both ends of the floor. He can add tricks to his offensive bag. Luka Doncic and Jalen Brunson are two examples of many players without an elite first step who get buckets by using their craft. Herro has plenty, but there is more to add. On defense, he needs strength and reps to make gains.
Tyler Herro can make a massive leap with one key improvement in his arsenal, but the developments have been slow in his first four NBA seasons.