Suggestions:

The thick, red, high-contrast lines separating the bars are reducing readability and clarity.

Aligning the flags at the right-hand end of the X axis labels would allow groupings to stand out more.

Swapping the X and Y axes would let you use larger text for the embedded revenue values and orient the smallest text more comfortably. You'd lose the fuel-filled vessel metaphor, but I'm not sure that's currently adding a lot.