I’ve been getting in shape over the past year—one question about focusing on specific area

I’ve always been thin. So now that I’m getting in shape, achieving abs and upper body strength was relatively straightforward.

But my ribs have always shown. Especially the bottom of my rib cage. Maybe the last three or four ribs, and it just looks weird. Is there something people would recommend, either diet-wise or (preferably) workouts to target that specific area?

Help would be appreciated!