Microeconomics concepts greatly help us to understand the broad aggregates which are used in Macroeconomics to understand the overall functioning of an economy but are there any ways in which Macroeconomics help us to understand the behavior of individual units?
[...] are there any ways in which Macroeconomics help us to understand the behavior of individual units?
Putting aside the totological cases in which a utility would directly integrate macroeconomic signals such as, e.g. key-rates, AFAIK, no there are not.
As you mention, Macroeconomics is about aggregate level considerations and/or identities That being said, you will find theoretical frameworks, such as General Equilibrium Theory that imply/represent microfounded behaviours with the intention of adding them up instead of directly dealing with accounting-like macro aggregates.