If it helps you pretend this is a hypothetical, if Smart were to improve how would he do it?
Smart's current career shooting splits (85 games over two seasons):
28.8% of his shots are from 0-3 and he shoots
52.7% on those attempts
13.5% of his attempts are from 3-10 and he shoots 23.4% on those attempts
5.8% of his attempts are from 10-16 feet and he shoots
39.5% on those attempts
8.3% of his attempts are from 16 feet to 3, and he shoots 31.6% on those attempts.
43.6% of his attempts are from 3P territory, and he shoots
30.9% on those attempts.
None of these numbers are "good" relatively speaking, but they provide a blueprint for how Smart could become at least adequate offensively.
So how could he improve?
(1) Balance out the number of attempts from three point territory with the number of attempts in the paint.
(2) Finish in the paint closer to what he did as a rookie (56%) versus what he's done this year (46.7%). 55% is the minimum there. He'll probably never be a great scorer from outside so he has to finish well.
(3) Try to expand his in-between game by taking more shots from 10-16 feet. This year he's shooting 44% from that range, though it's a small sample.
(4) Improve as an outside shooter to where he's hitting better than 33% of his shots CONSISTENTLY. As a rookie, he shot 33.5% which is adequate, but he was pretty hot and cold. He shot 24% from three in November, then 38% in December and 42% in January, followed by 27% in February.
(5) Improve as a free throw shooter (aim for >75%) and increase his free throw rate. Currently his career free throw rate is 27.6%. That means he shoots one free throw for about every four field goal attempts. He needs to get up around 35-40%, where guys like Isaiah Thomas, Kyle Lowry, and Russell Westbrook live.