If there's one area Los Angeles could use an upgrade, it's with their bigs. Ivica Zubac and Nicolas Batum are solid players, there's likely not a title team that would have both players in their starting lineup. Replacing one of those guys for a defensive anchor down low could be huge for the team. The Clippers were not a bad defensive team, but a versatile rim protector could make them a matchup nightmare on defense. Another area of focus could be to add a primary ball handler and playmaker. Jackson is more of a scorer than a passer, and George and Leonard are better served as secondary/tertiary ball handlers than primary. There's been rumors of the Clippers being interested in Kyrie Irving, but I personally don't like the fit. He's talented, for sure, but his behavior is unpredictable and he would be a third star on the team to have injury concerns.
To me, it's more likely the Clips go for a lower-tier star or high-end role players to shore up some of their weaknesses. Whatever they decide to do, they have an entire offseason to figure things out, and by the end of it, they will be considered, at least on paper, to be in the top tier of NBA teams.