Boost: Improve rebounding
It is no secret that much of the Suns' rebounding is carried by Jusuf Nurkic. The team's starting center pulls down 10.3 rebounds per game, but only one other player on the roster even averages half of Nurkic's rebounding numbers.
Phoenix needs to boost their subpar rebounding in a major way, as they currently rank in the bottom half of the league in total team rebounds per game. This is a team with legitimate championship aspirations, and failing to address a rebounding need could easily lead to a quick exit in the playoffs.
Daniel Gafford, Royce O'Neale, Nick Richards and Richaun Holmes are just a few of the capable rebounders that appear to be on the market leading up to this trade deadline. Acquiring any of them via trade without sacrificing one of the Suns' core pieces would be a major win.
Something Phoenix would likely hope to do is make a trade for a strong rebounder that can also allow for lineup flexibility. A player like Andre Drummond could prove difficult to use in some settings due to his lack of mobility and poor outside shooting. But someone who can be played in several roles or at different positions would likely be more of the Suns' type of target.